selinux: fix setting of security labels on NFS

Before calling into the filesystem, vfs_setxattr calls
security_inode_setxattr, which ends up calling selinux_inode_setxattr in
our case.  That returns -EOPNOTSUPP whenever SBLABEL_MNT is not set.
SBLABEL_MNT was supposed to be set by sb_finish_set_opts, which sets it
only if selinux_is_sblabel_mnt returns true.

The selinux_is_sblabel_mnt logic was broken by eadcabc697e9 "SELinux: do
all flags twiddling in one place", which didn't take into the account
the SECURITY_FS_USE_NATIVE behavior that had been introduced for nfs
with eb9ae686507b "SELinux: Add new labeling type native labels".

This caused setxattr's of security labels over NFSv4.2 to fail.

Cc: [email protected] # 3.13
Cc: Eric Paris <[email protected]>
Cc: David Quigley <[email protected]>
Reported-by: Richard Chan <[email protected]>
Signed-off-by: J. Bruce Fields <[email protected]>
Acked-by: Stephen Smalley <[email protected]>
[PM: added the stable dependency]
Signed-off-by: Paul Moore <[email protected]>

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