Description of problem:
When installing mongo cartridge, a mongod process is left, it should be terminated after installation.
# yum install openshift-origin-cartridge-mongodb
<--snip-->
  Installing : openshift-origin-cartridge-mongodb-1.19.3.2-1.el6op.noarch                                                                                                            1/1 
/usr/libexec/openshift/cartridges/mongodb/bin/mkjournal: line 57: 33425 Terminated              scl enable mongodb24 "mongod     --dbpath ${tmpdir}     --journal     --noprealloc     --smallfiles     --bind_ip 127.0.0.2     --port 27017     -f ${tmpdir}/mongodb.conf" 2>&1 > ${tmpdir}/mongodb.log
MongoDB starting journal saved: /usr/libexec/openshift/cartridges/mongodb/usr/journal-cache/journal.tar.gz
  Verifying  : openshift-origin-cartridge-mongodb-1.19.3.2-1.el6op.noarch                                                                                                            1/1 

Installed:
  openshift-origin-cartridge-mongodb.noarch 0:1.19.3.2-1.el6op                                                                                                                           

Complete!

# ps -ef|grep mongo
root     33437 33429  2 01:04 pts/0    00:00:00 mongod --dbpath /tmp/tmp.4ItopnO2bm --journal --noprealloc --smallfiles --bind_ip 127.0.0.2 --port 27017 -f /tmp/tmp.4ItopnO2bm/mongodb.conf


Firstly, install mongo cartridge should not leave a useless mongod process
Secondly, if user want to run mongo server as openshift datastore, that would be blocked.

Workaround:
Kill existing mongod process and its parent process, or reboot this system.

Version-Release number of selected component (if applicable):
openshift-origin-cartridge-mongodb-1.19.3.2-1.el6op.noarch

How reproducible:
Always

Steps to Reproduce:
1.Using openshift.sh to install node+datastore.
2.After installation, found mongod service could not be started.
# /etc/init.d/mongod status
mongod dead but pid file exists
Seen from mongod log file, it is saying 27017 is in use.
3.Check mongo process running in system.
# ps -ef|grep 11843
root     11843     1  0 20:53 pts/0    00:00:00 /bin/bash /var/tmp/sclqqu04A
root     11854 11843  0 20:53 pts/0    00:00:42 mongod --dbpath /tmp/tmp.V7pSVRGb6m --journal --noprealloc --smallfiles --bind_ip 127.0.0.2 --port 27017 -f /tmp/tmp.V7pSVRGb6m/mongodb.conf
4.Check openshift-origin-cartridge-mongodb rpm post scripts.
# rpm -q --scripts openshift-origin-cartridge-mongodb
postinstall scriptlet (using /bin/sh):
/usr/libexec/openshift/cartridges/mongodb/bin/mkjournal /usr/libexec/openshift/cartridges/mongodb/usr/journal-cache/journal.tar.gz
preuninstall scriptlet (using /bin/sh):
if [ $1 -eq 0 ]; then
  /bin/rm -f /usr/libexec/openshift/cartridges/mongodb/usr/journal-cache/journal.tar.gz
fi

Actual results:
After install mongo cartridge on a system, one mongo process is left.

Expected results:
mongo process should be terminated.

Additional info: