Changes

jobs/osmo-gsm-tester-runner: fix syntax errors

Fix the syntax of this file, so it is compatible with Jenkins Job
Builder 6.3.0.

* In shell blocks, {{ and }} needs to be used instead of { and } if the
  string in brackets does not refer to a JJB variable.
* "${OSMO_GSM_TESTER_BRANCH}" would refer to a non-existing JJB var,
  instead we want the shell variable here (that jenkins sets), so omit
  the {}.

Change-Id: I5401d75ac40b8267b59443792079249f00b02111

jobs/osmo-gsm-tester-runner: include-raw -> include-raw-expand

Fix for:
  UserWarning: Tag '!include-raw:' is deprecated, switch to using '!include-raw-expand:'

Change-Id: Ieceeb87fea88fb5f9591153d424cd25569763a31

jobs/osmo-gsm-tester_gerrit: disable

Disable it, as currently the osmo-gsm-tester jenkins nodes are offline
and starting such a job just leads to a job that is stuck in the jenkins
queue.

Change-Id: Idf5dd17ca24e9589ef9175de42b5102c79285a7d