[Buildroot] Add config to nfsd to set number of threads

[Andreas Ehmanns]

Dear All,
actually the nfs-utils package provides an NFS server together with an 
init script. The number of threads the NFS server shall use is 
hard-coded in the init script. The attached patch moves this parameter 
to a config file under /etc which is read by the init script.

Additionally the return value of the init script in case of an not 
existing file has been changed from 0 to 2 to indicate an error condition.

What do you think?

Regards,
Andreas

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