Make neutron full job voting

Changes in this patch:
- Add neutron full job to neutron integrated gate queue,
  and make it voting
- Add postgresql full job for Neutron, set it as non-voting, since
  it has never beene executed so far.
- Run mysql smoke job only for havana and icehouse stable branches,
  keep running postegresql smoke job for every branch to preserve
  the number of tempest runs for each neutron patch.
- (side-effect) Make neutron full job voting for projects using the
  integrated gate

Change-Id: I2847966c084971459dbae8dc86b4c412d3cb91d4
Merge "Make neutron full job voting"