Rename OpenStack Quantum to Neutron

This rename happened in now current release OpenStack Havana.

RHEL6 "backport" of sosreport master dd7857dd39deb69e26cb1fa5b0549ebc2ba82428
Note that in this branch we keep openstack_quantum plugin since we want to
support both Grizzly and Havana.

Signed-off-by: Alan Pevec <apevec@redhat.com>