Set trigger_timer from build file if unset. (#922)
Set trigger_timer from build file if unset. (#922)

* Set trigger_timer from build file if unset.

I noticed that when using generate_ci_job.py rather than
generate_ci_jobs.py to manually deploy some test jobs that in the former
case the scheduled job configuration was not being set.

* Deprecate trigger_timer kwarg of configure_ci_job.

The value should come directly from the build file and since the
only existing caller provides a build_file as well as the trigger_timer
it can be removed without affecting the behavior of other callers.
ros-infrastructure/ros_buildfarm,ros-infrastructure/ros_buildfarm,ros-infrastructure/ros_buildfarm