Explicitly set MongoDB config file
Explicitly set MongoDB config file

Depending on the combination of Linux and OpenStack distros, we
now have different configuration files for MongoDB. Given it can
create issues because different mongodb-server 2.6 packages have
different configuration files, we are explicitly defining the
config file name:

- Fedora 21 with RDO: /etc/mongodb.conf
- CentOS 7 and RHEL 7 with EPEL and RDO: /etc/mongod.conf
- RHEL 7 with RHEL OSP: /etc/mongodb.conf

The differences also affect the sharding configuration file
(mongos.conf or mongodb-shard.conf), but Packstack does not
configure sharding.

Fixes: rhbz#1212174
Change-Id: If138a5bcd916856090b2716bc17d5e910fa325ee

fr34k8/packstack,xbezdick/packstack,imcsk8/packstack,stackforge/packstack,mahak/packstack,openstack/packstack,fr34k8/packstack,stackforge/packstack,fr34k8/packstack,xbezdick/packstack,imcsk8/packstack,mahak/packstack,imcsk8/packstack,stackforge/packstack,xbezdick/packstack,mahak/packstack,openstack/packstack,openstack/packstack