LU-11040 utils: improve mount usage/man page

LU-11040 utils: improve mount usage/man page

Improve the description of the mount.lustre.8 man page and usage:
- provide separate SYNOPSYS for client and server mount commands
- move "acl" option out of general options into server-only options,
  since client option was removed and ACLs are only controlled by MDS
- correct "CLIENT OPTIONS" section to be named "SERVER OPTIONS"
- add checksum, lruresize, lazystatfs, 32bitapi, user_fid2path usage
- mark the default values of the options in the usage message

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I28fe0f13d363e0a26ffcbc1ba9923e4fd35804f0
Reviewed-on: https://review.whamcloud.com/32481
Tested-by: Jenkins
Reviewed-by: Emoly Liu <emoly@whamcloud.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>