List of filesystems is not honoured

All filesystems are checked, e.g.,

~~~~{.yaml}
gpfsbeat:
  filesystem: "scratchkyukon"
~~~~

Still checks all filesystems:

~~~~
2017-09-08T20:03:31+02:00 INFO Renewed devices list: [kyukondata kyukonhome kyukonirods kyukonscratch]
~~~~