The new rmc daemon inherits from the project-wide class server::Daemon.
The new rmc daemon does not need to add any command-line options of its
own; what is provided by server::Daemon is sufficient.  I am therefore
removing the now redundant RmcdCmdLine class.

In detail:

Renamed legacymsg::RmcProxyImpl to legacymsg::RmcProxyTpcIp
Renamed legacymsg::VdqmProxyImpl to legacymsg::VdqmProxyTcpIp
Renamed legacymsg::VmgrProxyImpl to legacymsg::VmgrProxyTcpIp
Renamed legacymsg::DummyVmgrProxy to legacymsg::VmgrProxyDummy
Renamed legacymsg::DummyVdqmProxy to legacymsg::VdqmProxyDummy
Renamed legacymsg::DummyRmcProxy to legacymsg::RmcProxyDummy

Bottom-line, if the concrete sub-class of a pure abstract class can have
a meaningful name without the need to use the Impl or Implemention
suffix then avoid using the suffix.

This commit also renames the "Dummy" proxy classes so that they are
easier to see when their source code directory is listed
alphabetically.

DataPools are pools of data, that is DiskCopies are directly placed in the pool, without any notion of FileSystem.
DiskServers can be associated to such a pool and are thus able to server all the DiskCopies present in the pool (several diskservers can serve the same DiskCopy).
The Schema has been modified and all the SQL code has been adapted to the new concept.
The change should be backward compatible, in the sense that regular DiskPools are still working the same way as they did before.
Note that DiskPools and DataPools can be mixed within a given service class but that there is no optimization of such a setup. This setup is more foreseen for transitionnal periods where optimization is a secondary issue.

Dropped unused entry point getBestDiskCopyToRead. This was used by xroot in long gone non scheduled mode

This commit also moves derived classes.

This commit can be considered another step towards removing the need for
a separate tape directory.

This commit also moves derived classes.

This commit can be considered another step towards removing the need for
a separate tape directory.

This commit also moves derived and supporting classes.

This commit can be considered another step towards removing the need for
a separate tape directory.

As a step closer to removing the need for a separate castor/tape
directory, I have moved castor::tape::legacymsg to
castor::legacymsg.

Renamed member variables to canonycal m_
Renamed TaskInjector->end to TaskInjector->finish() to match other threads conventions.
Fixed missing finish() in RecallTaskInjectorTest
Added missing finish() call in TapeReadTSingleThread.

Fixed missing member initialization
Fixed missing last call flag
Adpated to the injection of the NULL pointer as the end of session indicator.
Fixed missing path indication in the recall description.

added a thread logging parameter, indicating the thread involved
added startup and finish log messages for threads.

The old rmd daemon is now used to mount and unmount tapes in SCSI
libraries.

Conflicts:
	castor/tape/tapeserver/daemon/DiskWriteThreadPool.hpp