Fix CVMFS check

Since /cvmfs/etp.kit.edu/.cvmfsdirtab does not exists anymore and on all all ETP resources autofs mounts /cvmfs we can switch to cvmfs_config probe to check CVMFS on the WNs.

assigned to @lreuter

added 1 commit

• 61f1966b - Fix check for external resources

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merged

mentioned in commit a789a059