behavior as file systems that use the monolithic /sbin/mount command.

behavior as file systems that use the monolithic /sbin/mount command.
See the MS_NOMTAB macro in utils-linux-ng/mount/mount.c.

Note that mount(8) has MS_USERS and MS_USER in the "nomtab" category
as well, but mount.nfs needs to record those values so that unmounting
a user-mounted NFS file system can work.

While we're here, fix some white space damage in fix_opts_string().

This is a partial fix for:

  https://bugzilla.linux-nfs.org/show_bug.cgi?id=188

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>