LU-5587 lustre: require HAVE_SERVER_SUPPORT in md_object.h

LU-5587 lustre: require HAVE_SERVER_SUPPORT in md_object.h

Move the definition of struct seq_server_site from md_object.h to
lustre_fid.h. Uninclude md_object.h from files that don't need it. In
md_object.h generate a preprocessor error if HAVE_SERVER_SUPPORT is
not defined.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Ie3fd464ef4a71f09ccaffae409901cb48705301b
Reviewed-on: http://review.whamcloud.com/11756
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>