Use proper name for neutron full job in gate queue

Commit 86fe738 added the neutron full job to the integrated gate.
However, the prefix for the job name in the gate queue should be
'gate' rather than 'check'.

Change-Id: Ida968768e58e77f7d00db6cdac36a765b0450d98
Merge "Use proper name for neutron full job in gate queue"