jobs/master-builds.yml: add missing job type 'distcheck'
We do have this job type in gerrit-verifications.yml, so it's executed for each patch submitted to Gerrit. However, we are not executing 'distcheck' during the daily master builds - fix this.
Change-Id: I4898ba712a29a6afc34bc22adec6a3131ce8c794 Fixes: 31fd5cf0 ("gerrit-verifications: execute 'distcheck' job for pysim")
I've already implemented this logic in 6a3b8a0, however by mistake I added it to master-builds.yml instead of gerrit-verifications.yml. This is wrong because we specifically need this feature for Jenkins verification, not for the master builds.
For daily master builds, on the other hand, we specifically want to execute all existing job types, so revert my recent changes from master-builds.yml, but keep the new job type.
