*****
cat /srv/salt/base/xymonclient.sls
xymonclient-service:
  service.running:
    - name: salt['pillar.get']("xymonclient:%s" % salt['grains.get']('os', ''), '')

*****
cat /srv/salt/pillar/test.sls
xymonclient:
  Debian: hobbit-client
  RedHat: xymon-client

******
salt lunidebrepos1.unige.ch service.restart xymonclient
lunidebrepos1.unige.ch:
    False

******
salt lunidebrepos1.unige.ch service.restart xymon-client
lunidebrepos1.unige.ch:
    False