Description of problem:
Execute "oo-admin-yum-validator -o 2.2 --role broker --role client --role node -p" in new env, it throws out traceback 

Version-Release number of selected component (if applicable):
ose2.2.3/2014-12-16.1

How reproducible:
Always

Steps to Reproduce:
setup:
New rhel66 env:install the latest openshift-enterprise-yum-validator
register rhn
1.oo-admin-yum-validator -o 2.2 --role broker --role client --role node -p
2.New env register rhsm
oo-admin-yum-validator -o 2.2 --role broker --role client --role node -p

Actual results:
1.# oo-admin-yum-validator -o 2.2 --role broker --role client --role node -p
Detected OpenShift repository subscription managed by RHN Classic or RHN Satellite
The required OpenShift repositories are missing:
    jb-ews-2-x86_64-server-6-rpm
    rhel-x86_64-server-6-ose-2.2-infrastructure
    rhel-x86_64-server-6-ose-2.2-rhc
    rhel-x86_64-server-6-rhscl-1
    rhel-x86_64-server-6-ose-2.2-node
Please verify that an OpenShift subscription is attached to this system using either RHN Classic or Red Hat Subscription Manager by following the instructions here: https://access.redhat.com/site/articles/522923
Checking if yum-plugin-priorities is installed
Checking channel/repository priorities
Resolving repository/channel/subscription priority conflicts
To resolve conflicting repositories, update /etc/yum/pluginconf.d/rhnplugin.conf with the following changes:
    Set "priority=20" in the [rhel-x86_64-server-6] section
Repositories have been found which are missing one or more required package exclusions.
To prevent problems due to package conflicts, modify these repositories according to the directions given below.
Set package exclusions for RHN-managed repos by updating /etc/yum/pluginconf.d/rhnplugin.conf with the following changes:
Traceback (most recent call last):
  File "/usr/bin/oo-admin-yum-validator", line 1078, in <module>
    validate_yum()
  File "/usr/bin/oo-admin-yum-validator", line 1075, in validate_yum
    sys.exit(yum_vdtr.main())
  File "/usr/bin/oo-admin-yum-validator", line 970, in main
    self.run_checks()
  File "/usr/bin/oo-admin-yum-validator", line 947, in run_checks
    if not (self.set_excludes() or self.opts.report_all):
  File "/usr/bin/oo-admin-yum-validator", line 778, in set_excludes
    self._output_excludes()
  File "/usr/bin/oo-admin-yum-validator", line 735, in _output_excludes
    (exclusion, repoid))
NameError: global name 'exclusion' is not defined
2.# oo-admin-yum-validator -o 2.2 --role broker --role client --role node -p
Detected OpenShift repository subscription managed by Red Hat Subscription Manager

Required OpenShift repositories have been found which are currently disabled. Enable them according to the following directions.
Enable Yum and/or locally-managed RHSM repositories by running:
    # yum-config-manager --enable rhel-server-rhscl-6-rpms
    # yum-config-manager --enable rhel-6-server-ose-2.2-rhc-rpms
    # yum-config-manager --enable rhel-6-server-ose-2.2-node-rpms
    # yum-config-manager --enable jb-ews-2-for-rhel-6-server-rpms
    # yum-config-manager --enable rhel-6-server-ose-2.2-infra-rpms
Checking if yum-plugin-priorities is installed
Checking channel/repository priorities
Resolving repository/channel/subscription priority conflicts
To resolve conflicting repositories, update repo priority by running:
    # yum-config-manager --setopt=rhel-6-server-rpms.priority=20 rhel-6-server-rpms --save
Repositories have been found which are missing one or more required package exclusions.
To prevent problems due to package conflicts, modify these repositories according to the directions given below.
Set package exclusions for Yum repositories and/or locally-managed RHSM repositories by running:
    # yum-config-manager --setopt=jb-ews-2-for-rhel-6-server-rpms.exclude="httpd httpd-tools mod_ssl" jb-ews-2-for-rhel-6-server-rpms --save
    # yum-config-manager --setopt=rhel-6-server-rpms.exclude="tomcat6*" rhel-6-server-rpms --save
    # yum-config-manager --setopt=rhel-6-server-ose-2.2-node-rpms.exclude="facter" rhel-6-server-ose-2.2-node-rpms --save
Please re-run this tool after making any recommended repairs to this system



Expected results:
1.Should prompt correct exclude info

Additional info:
Env register rhsm: execute "yum-config-manager --setopt=jb-ews-2-for-rhel-6-server-rpms.exclude="httpd httpd-tools mod_ssl" jb-ews-2-for-rhel-6-server-rpms --save" success
...
exclude = httpd,
   httpd-tools,
   mod_ssl
...