Description of problem:
When using oo-diagnostics to check the broker, got an error:
"FAIL: test_broker_cache_permissions
broker application cache contains files belonging to root; please clear the cache "
Then use # cd /var/www/openshift/broker
         # bundle exec rake tmp:clear
to clear the cache on the broker host. But the error was still there.

Version-Release number of selected component (if applicable):
devenv_2625

How reproducible:
Always

Steps to Reproduce:
1.Log into broker
  # /root/.source_build/origin-server/util/oo-diagnostics -v
  
Actual results:
[root@ip-10-195-113-46 broker]# /root/.source_build/origin-server/util/oo-diagnostics -v
INFO: loading list of installed packages
INFO: OpenShift broker installed.
INFO: OpenShift node installed.
INFO: running: test_dns_resolution
INFO: checking that DNS resolution works at all
INFO: running: test_enterprise_rpms
INFO: skipping test_enterprise_rpms
INFO: running: test_selinux_policy_rpm
INFO: rpm selinux-policy installed with at least version 3.7.19-155.el6_3.8
INFO: running: test_broker_cache_permissions
FAIL: test_broker_cache_permissions
broker application cache contains files belonging to root; please clear the cache
INFO: running: test_nodes_public_hostname
INFO: checking that each public_hostname resolves properly
INFO: PUBLIC_HOSTNAME ec2-54-242-39-196.compute-1.amazonaws.com for ip-10-195-113-46 resolves to 10.195.113.46
INFO: checking that each public_hostname is unique
INFO: running: test_nodes_public_ip
INFO: checking that public_ip has been set for all nodes
INFO: PUBLIC_IP 54.242.39.196 for ip-10-195-113-46
INFO: checking that public_ip is unique for all nodes
INFO: running: test_nodes_cartridges_from_broker
INFO: checking that all node hosts have cartridges installed
INFO: cartridges for ip-10-195-113-46: mongodb-2.2|switchyard-0.6|abstract-httpd|nodejs-0.6|jbossews-2.0|cron-1.4|mysql-5.1|abstract-jboss|zend-5.6|ruby-1.9|postgresql-8.4|abstract|jbossas-7|haproxy-1.4|10gen-mms-agent-0.1|python-2.6|jenkins-1.4|ruby-1.8|phpmyadmin-3.4|metrics-0.1|jbosseap-6.0|rockmongo-1.1|diy-0.1|jbossews-1.0|jenkins-client-1.4|php-5.3|perl-5.10
INFO: checking that same cartridges are installed on all node hosts
INFO: checking that broker's cache is not stale
INFO: API reports carts: nodejs-0.6|jbossews-2.0|zend-5.6|ruby-1.9|jbossas-7|python-2.6|jenkins-1.4|ruby-1.8|jbosseap-6.0|diy-0.1|jbossews-1.0|php-5.3|perl-5.10|mongodb-2.2|switchyard-0.6|cron-1.4|mysql-5.1|postgresql-8.4|haproxy-1.4|10gen-mms-agent-0.1|phpmyadmin-3.4|metrics-0.1|rockmongo-1.1|jenkins-client-1.4
INFO: running: test_broker_accept_scripts
INFO: running rhc-accept-devenv
INFO: rhc-accept-devenv ran without error:
--BEGIN OUTPUT--
PASS

--END rhc-accept-devenv OUTPUT--
INFO: running: test_node_accept_scripts
INFO: running oo-accept-node
INFO: oo-accept-node ran without error:
--BEGIN OUTPUT--
PASS

--END oo-accept-node OUTPUT--
INFO: running rhc-accept-node
INFO: rhc-accept-node ran without error:
--BEGIN OUTPUT--
PASS

--END rhc-accept-node OUTPUT--
INFO: running: test_broker_httpd_error_log
INFO: running: test_broker_passenger_ps
INFO: checking the broker application process tree
INFO: running: test_for_nonrpm_rubygems
INFO: checking for presence of gem-installed rubygems
INFO: looking in /opt/rh/ruby193/root/usr/local/share/gems/specifications/*.gemspec /opt/rh/ruby193/root/usr/share/gems/specifications/*.gemspec
WARN: test_for_nonrpm_rubygems
      The following lines indicate rubygems that were installed from outside
      sources rather than via yum/RPM. These are unsupported and likely to
      break OpenShift. If you see multiple versions of any gems with
      'gem list' you have likely overridden OpenShift-installed gems.
      Uninstall as necessary with 'gem uninstall <gemname> -v <version>'.
        
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/capybara-1.1.4.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/childprocess-0.3.6.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/cmdparse-2.0.5.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/fakefs-0.4.2.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/ffi-1.2.0.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/hub-1.10.3.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/kramdown-0.14.1.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/libwebsocket-0.1.7.1.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/net-ssh-gateway-1.1.0.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/rally_rest_api-1.0.5.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/rspec-1.3.0.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/rubyzip-0.9.9.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/sauce-2.2.2.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/selenium-webdriver-2.27.2.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/websocket-1.0.6.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/xpath-0.1.4.gemspec is not owned by any package
file /opt/rh/ruby193/root/usr/local/share/gems/specifications/zip-2.0.2.gemspec is not owned by any package

INFO: running: test_for_multiple_gem_versions
INFO: checking for presence of gem-installed rubygems
INFO: running: test_node_mco_log
INFO: running: test_pam_openshift
1 WARNINGS
1 ERRORS

Expected results:
Should work well without error

Additional info:
Noticed that the error info is triggered by  
 # if `find /var/www/openshift/broker/tmp/cache/ -user root`.length > 0 
defined in function test_broker_cache_permissions in file oo-diagnostics.
So check the related files' property.

[root@ip-10-118-62-244 broker]# find /var/www/openshift/broker/tmp/cache/ -user root
/var/www/openshift/broker/tmp/cache/

[root@ip-10-118-62-244 broker]# ll /var/www/openshift/broker/tmp/
total 16
drwxrwx---. 6 root libra_user 4096 Dec 24 03:30 cache
drwxrwx---. 2 root libra_user 4096 Dec 21 17:16 pids
drwxrwx---. 2 root libra_user 4096 Dec 21 17:16 sessions
drwxrwx---. 2 root libra_user 4096 Dec 21 17:16 sockets

[root@ip-10-118-62-244 broker]# ll /var/www/openshift/broker/tmp/cache/
total 16
drwxr-xr-x. 3 libra_passenger libra_user 4096 Dec 24 03:30 5C1
drwxr-xr-x. 3 libra_passenger libra_user 4096 Dec 24 03:30 780
drwxr-xr-x. 3 libra_passenger libra_user 4096 Dec 24 03:30 A83
drwxr-xr-x. 3 libra_passenger libra_user 4096 Dec 24 03:30 CC4