deployment: integration/slave-scripts has submodules

The integration/slave-scripts deployment is integration/jenkins.git
which has a bunch of submodules hosted on WMF Gerrit. We need to have
them deployed on minions as well.

bug: 57880
Change-Id: Ic898c972b7091ca950e2aee5e3ca2d111e05a521
Merge "deployment: integration/slave-scripts has submodules" into production