* Update manpage with more information about the ACL, guest access
  and that samba needs to be able to authenticate user(s).
* Add information that 'net' can be used to modify the share after
  ZFS sharing and that it will be undone with a 'zfs unshare'.
Closes: #1181
Do basic sanity checks in smb_available() to verify that the 'net'
command and the usershare directory exists.
Closes: #1124
Merge branch 'smbfs_fixes' into iscsi