Title: mounts: Fixed wrong handling of NFS mounts on Linux which are detected as stale
Level: 1
Component: checks
Class: fix
Compatible: compat
Edition: cre
State: unknown
Version: 1.2.8p25
Date: 1498484953

Such mounts are marked with '\040(deleted)' und therefore discovered
as new services while the related services report
{{UNKNOWN - filesystem not mounted}}.

This has been fixed. The service now reports
{{WARN - Mount point detected as stale}}.

Please see
https://utcc.utoronto.ca/~cks/space/blog/linux/NFSStaleUnmounting
for more information.
