[Natty] SRU: nfsd4: permit read opens of executable-only files

[Chris J Arges]

SRU Justification

Impact:

NFSv4 mount point does not allow binary files to run when permissions
are set to 111.

Fix:

Upstream commit a043226bc140a2c1dde162246d68a67e5043e6b2.
Applies with minor conflicts.

Testcase:
Mount a directory using nfsv4. Inside that directory place a binary with
---x--x--x permissions. Try to execute the binary. Without this patch it
will not execute.

Notes:
This patch fixes this issue, but requires support from the nfs client as
well. The Natty version of the client will need additional fixes to
complete the fix. The upstream maintainer has verified that the kernel
is doing the right thing. http://comments.gmane.org/gmane.linux.nfs/43028

Thanks,
--chris j arges
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