Adding python-pbr-0.8.0-1.el7.noarch.rpm and updating python-neutronclient in redhat70

neutron net-list now requires python-pbr but this package is currently missing in redhat70 contrail_install_repo
and python-pbr has to be in requires list of python-neutronclient

Closes-Bug: 1382135

Change-Id: Ib78a47a6b65d50f821d30ff2dec1ba52ea2a0176
Merge "Adding python-pbr-0.8.0-1.el7.noarch.rpm and updating python-neutronclient in redhat70"