Fixed h/rfcntl.h which missed multiple inclusion guards entirely.

POLLIN is unfortuntaley not the logical or of POLLRDNORM and POLLRDBAND
on SLC 5.  I therefore replaced POLLIN with the logical or.  I also
added POLLPRI into the mix to cover all possible types of read event.

I have added the values of reqHost and server to the log.

I introduced a bug into sstrerror() when I added error checking code
around the call to Cglobals_get().  The hash of the offending commit is:

051afce9

Before my so say improvements, the return value of Cglobals_get() was
not checked.  I added a check that assumed an error had occured if the
return value was non-zero.  Unfortuntaley for me, the return values 0
and 1 both mean success.  A return value of -1 signifies a failure.

The switch statement within TapeDaemon::registerTapeDriveWithVdqm()
was missing a break statment.  This caused an exception to be thrown.

This commit adds code to the tapeserverd daemon to register its
drives with the vdqmd daemon.  There is a problem with the code
in that it fails to register two drives in the up state.  This
will be fixed later.

Added a constraint on MigrationJob.FileSize so that it cannot be <= 0. In particular, this makes sure that we do not try to migrate 0 size file

With this commit tapeserverd connects to the vdqm using Cgethostbyname().
It is planned to replace this use of Cgethostbyname() by getAddrInfo().

Eric found that the underlying C function getaddrinfo() is thread
safe because of RFC 3493.

The getaddrinfo() function will be used instead of the inetPton() function,
I am therefore removing inetPton() in order to reduce deadwood.

This new overloaded version still needs to be implemented.  It currently
throws an exception.

This version of connectToVdqm() is based on Cgethostbyname().  This is
a temporary implementation.  I would like that it is replaced by code
based around getaddrinfo() which is both standard and thread-safe on
linux and is therefore better than gethostbyname() whose rentrant
cousin gethostbyname_r() is a GNU extension.  According to the BSD
manual pages, the getaddrinfo() function is a replacement for and
provides more flexibility than gethostbyname().

I cannot find any information about the thread safety of getaddrinfo()
on MAC.