LU-14291 lustre: limit header scope for server only handling

LU-14291 lustre: limit header scope for server only handling

The lustre headers have server only function declarations and
inline functions. Only include them if HAVE_SERVER_SUPPORT is
set. This gets us closer to building OpenSFS modules against
a Linux kernel with a native Lustre client. Move a few things
from UAPI headers that are used only by kernel space to kernel
only headers where they belong.

For mdc_changlog.c a debug message access a field that is
available the server which is never the case. Since its
nonsense we can remove the report of this field

Change-Id: I6e2d3bebc121aef97fe69344d496e230f62b28ad
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/43096
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Lai Siyao <lai.siyao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>