LU-13907 llite: don't set FS_REQUIRES_DEV on client

LU-13907 llite: don't set FS_REQUIRES_DEV on client

If doing a client-only build, do not set the FS_REQUIRES_DEV flag
for the 'lustre' filesystem type.  This is only needed on the server,
but the filesystem type declaration is shared between both.

In master, this was fixed by declaring a new 'lustre_tgt' filesystem
type and using that for server filesystem mounts.  However, for 2.12
this is overkill, and it is possible to get a 95% fix by dropping
the FS_REQUIRES_DEV flag for the common case of client-only builds.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Change-Id: Iab2e78515aba018e2a6bceb324ad1b8a313ebbe5
Reviewed-on: https://review.whamcloud.com/39674
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>