Edit docs for docs.opentack.org/developer/
Edit docs for docs.opentack.org/developer/

Add missed steps in the installation process for running tests.
Mongodb and libmysqlclient-dev packages need to be installed for
Ubuntu12.04 and mongodb and mariadb-devel.x86_64 (or .i386)
need to be installed on Fedora20.

This information has been added to:
doc/source/contriburing/source.rst.

DocImpact
Closes-Bug: #1368974
Change-Id: I163879498b37866c8679b7f69ba60abaacc2e017

fabian4/ceilometer,eayunstack/ceilometer,fabian4/ceilometer,Juniper/ceilometer,openstack/aodh,ityaptin/ceilometer,isyippee/ceilometer,m1093782566/openstack_org_ceilometer,sileht/aodh,mathslinux/ceilometer,pczerkas/aodh,isyippee/ceilometer,ityaptin/ceilometer,MisterPup/Ceilometer-Juno-Extension,Juniper/ceilometer,m1093782566/openstack_org_ceilometer,MisterPup/Ceilometer-Juno-Extension,openstack/aodh,mathslinux/ceilometer,r-mibu/ceilometer,sileht/aodh,maestro-hybrid-cloud/ceilometer,cernops/ceilometer,openstack/ceilometer,pkilambi/ceilometer,pczerkas/aodh,cernops/ceilometer,chungg/aodh,eayunstack/ceilometer,chungg/aodh,froyobin/ceilometer,idegtiarov/ceilometer,pkilambi/ceilometer,redhat-openstack/ceilometer,idegtiarov/ceilometer,redhat-openstack/ceilometer,maestro-hybrid-cloud/ceilometer,froyobin/ceilometer,openstack/ceilometer,r-mibu/ceilometer