[Hardy] SRU: SUNRPC: Fix autobind on cloned rpc clients

[Stefan Bader]

Stefan Bader wrote:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/212485
> Bug: #212485, #341783
> 
> SRU justification:
> 
> Impact: Having NFS mounted filesystems with autobinding in use there seems
> to be a good chance that cloned clients might call rpcb_getport_async()
> and thus trigger a Bug() statement in the code.
> 
> Fix: A cherry pick from upstream to walk to the parent client to find out
> who "owns" the port. Fix was verified to be working.
> 
> Testcase: (from the report)
> - desktop system mounts /home/ with nfs4
> - login with gdm, start firefox and do some browsing, by entering some
>   urls in the location bar
> - issue some find /home & commands
> - unplug the network cable
> 
> 
Applied

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