Set volume/build_timeout for zuul jobs

The default in tempest is 196, and we're seeing backup test failures
where the backup completes shortly after that.  So increase it to
300 in the  cinder-tempest-plugin-lvm-barbican-base-abstract job,
which should propagate it out to most of the other jobs.

Change-Id: I87c0669e91ba49a66a48b0722fcf140091f6b19f
1 file changed