aufs: bugfix, clear S_AUTOMOUNT

Aufs inode should not copy-up the inode S_AUTOMOUNT flag from its branch
inode. The S_AUTOMOUNT flag was introduced in linux-2.6.38, so this is a
long-lived bug.
Currently (linux-3.11-rc1 mainline), this flag is set only for
- Andrew File System support (AFS)
- CIFS (CIFS_FATTR_DFS_REFERRAL case only)
- NFS (NFS_ATTR_FATTR_MOUNTPOINT or NFS_ATTR_FATTR_V4_REFERRAL case only)
and I have never tested such branches.
Found and reported by Ken Elkabany and Aaron Staley who are using
OpenAFS (out of mainline) as an aufs branch.

Reported-by: Ken Elkabany <ken@picloud.com>
Reported-by: Aaron Staley <aaron@picloud.com>
Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
aufs: update the donator list

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Merge remote branch 'aufs3-standalone/aufs3.2/00base' into aufs3.2/10static
Merge branch 'aufs3.2/10static' into aufs3.2/11proc_map
Merge branch 'aufs3.2/11proc_map' into aufs3.2/18public