Added explicit dependencies for header files and replaced misplaced include to ensure parallel comilation.

Added tolerance to BackendRados::ScopedLock::release() when releasing a deleted object's lock.
Switched back to old style m_radosCtx.objects_begin() for compatibility with older releases of ceph.

Added a list method for the backends so we can clean up the rados store before running each unit test, which expects a fresh store.
Added a new command line tool to list the contents of the backends.

New URLs are rados://user@pool and file:///tmp/XXXXX. Otherwise, we fall back to interpreting
the URL as a bare path.

Removed the xroot devel packages from the listing of installed rpms because the reader was not requested to install them

Removed the exception throws in the non-implemented methods of the ARchiveJob and RetrieveJOB classes, since they were causing random segfaults in the unit tests, still we need to find the root cause (maybe or maybe not)

Removed the ability to get mode bits from EOS through xroot since this does not work, mode bits are currently hardcoded as 0666

Changed my mind: checking the accessibility of the mock name server base path only in the constructors of the mock name server

Checking the accessibility of the mock name server base path in each method (of the mock name server) and reporting meaningful error