Use "setcap -v" rather than "getcap" to verify capabilities
Use "setcap -v" rather than "getcap" to verify capabilities

The format of the output from "getcap" was changed in libcap commit
177cd41 ("A more compact form for the text representation of
capabilities").  Test 585 currently expects the output:

  /cvmfs/test.cern.ch/dir/capabilities = cap_chown+ep

but any version of libcap from version 2.41 onwards will instead
produce:

  /cvmfs/test.cern.ch/dir/capabilities cap_chown=ep

Fix by using "setcap -v" to verify the capability set, since this
method does not depend on the precise "getcap" output format.

Signed-off-by: Michael Brown <2a36638259b3302298d1519e970c48ecd5dbd43e@fensystems.co.uk>

cvmfs/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,DrDaveD/cvmfs,cvmfs/cvmfs,cvmfs/cvmfs