Update default branch in .gitreview to stable/liberty
Update default branch in .gitreview to stable/liberty

Change-Id: I5463e1ffb9e7fc772ba27dd7b7d7d2414a526b5a
Signed-off-by: Kyle Mestery <9cfbda34e625c7b0454bcb19a48d07c46f9097d2@mestery.com>

cloudbase/neutron,sebrandon1/neutron,apporc/neutron,eayunstack/neutron,bigswitch/neutron,klmitch/neutron,huntxu/neutron,bigswitch/neutron,apporc/neutron,MaximNevrov/neutron,mahak/neutron,huntxu/neutron,dims/neutron,MaximNevrov/neutron,jumpojoy/neutron,mahak/neutron,noironetworks/neutron,glove747/liberty-neutron,jumpojoy/neutron,openstack/neutron,openstack/neutron,wolverineav/neutron,wolverineav/neutron,noironetworks/neutron,eayunstack/neutron,igor-toga/local-snat,yanheven/neutron,yanheven/neutron,igor-toga/local-snat,cloudbase/neutron,openstack/neutron,sebrandon1/neutron,chitr/neutron,klmitch/neutron,mahak/neutron,chitr/neutron,dims/neutron,glove747/liberty-neutron