Missing space at the end of the conditional expression

Missing space in the expression which enables the exercises on the
stable jobs.

The '==' changed to '=' in order to be more POSIX.

Change-Id: Icd43d15b9d00ed9a8fbc38a8e7217be2bd0de9d1
Missing default value

Fixing:
'/opt/stack/new/devstack-gate/devstack-vm-gate.sh: line 122: [: :
integer expression expected'

Change-Id: I78a6339f622023580db3924069f174530cc7a447
Merge "Missing default value"