jobs/master,gerrit: fix pysim, sysmo-usim-tool

Don't attempt to create the CCACHE_DIR and chown it to osmocom-build for
the simtester jenkins node, and more generally all that were not
created with the ansible provisioning scripts. In case of simtester,
there is no osmocom-build user and we don't have the space there to use
ccache.

Fix for:
  chown: invalid user: ‘osmocom-build:osmocom-build’

Related: OS#5848
Change-Id: I339d9ba4ad0c959d7325820eb53bfa1f0e04c164
2 files changed