Make neutron packages provide and obsolete quantum

Added provides and obsoletes for corresponding quantum packages to
neutron and neutronclient packages. This should ease updates from
grizzly where quantum is called quantum.

Partial-bug: #1198041
Change-Id: I93b810c3cd8b0acf54c174d1c2133c46f2cdfc77
Merge "Make neutron packages provide and obsolete quantum"