#248 (Jun 29, 2021, 6:46:07 PM)

jenkins-common.sh: add image_suffix_is_master()

Since recently, we also have a new IMAGE_SUFFIX '2021q1-centos8'.
We cannot rely on image_suffix_is_latest() anymore, because this
prefix does not qualify as 'latest'.  If one needs to enable a
feature that is only available in master, then here is a way:

  if ! image_suffix_is_master; then
      # Patch the configuration files
  fi

Change-Id: I65df66cd2e14934bed8114618d6ffad7831d1025

ttcn3-bsc-test: enable A5/4 support in osmo-bsc.cfg

Conditionally exclude it for non-master versions of the IUT.

Change-Id: I59f81c2dd72ddc2d292f8f34281fa79289d49c6d
Related: SYS#5324