Fix QA flakiness
Fix QA flakiness

The newly added job QA has some flakiness with respect to its use of
gnt-job watch. Fix this by waiting until the canceling status is
replaced with the canceled status, or a timeout is reached.

Signed-off-by: Hrvoje Ribicic <be5828fca31f89218048bec4189e30a581aa65da@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

leshchevds/ganeti,bitemyapp/ganeti,andir/ganeti,apyrgio/snf-ganeti,ganeti-github-testing/ganeti-test-1,ganeti/ganeti,mbakke/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,apyrgio/snf-ganeti,grnet/snf-ganeti,onponomarev/ganeti,leshchevds/ganeti,dimara/ganeti,leshchevds/ganeti,mbakke/ganeti,mbakke/ganeti,andir/ganeti,yiannist/ganeti,bitemyapp/ganeti,apyrgio/ganeti,yiannist/ganeti,yiannist/ganeti,onponomarev/ganeti,ganeti/ganeti,andir/ganeti,dimara/ganeti,ganeti/ganeti,grnet/snf-ganeti