Use MAXHOSTNAMELEN (256) for the array holding the host_name in socket.c

Use MAXHOSTNAMELEN (256) for the array holding the host_name in socket.c
instead of 200.  Move the defines of True and False to rsync.h.  Eliminate
the defines of BOOL in loadparm.c and params.c because it is already
defined in rsync.h.  Changes suggested by Roman Gollent roman.gollent@wdr.com