Never retry node-specific commands
Never retry node-specific commands

Items placed in the retry queue are rerouted based on their vbucket.
Commands which have no vbucket and thus may be sent to any server; or
commands which are forwarded to a specific server should never be
retried.

Change-Id: I1d6417e541dbcb0591a8bcdb2faa40d818e4aaa4
Reviewed-on: http://review.couchbase.org/42285
Reviewed-by: Sergey Avseyev <87f6d5e4fd3644c3c20800cde7fd3ad1569370b3@gmail.com>
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

maxim-ky/libcouchbase,maxim-ky/libcouchbase,couchbase/libcouchbase,PureSwift/libcouchbase,maxim-ky/libcouchbase,PureSwift/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,maxim-ky/libcouchbase,kojiromike/libcouchbase,signmotion/libcouchbase,couchbase/libcouchbase,mnunberg/libcouchbase,kojiromike/libcouchbase,senthilkumaranb/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,mody/libcouchbase,mnunberg/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,PureSwift/libcouchbase,signmotion/libcouchbase,mnunberg/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,senthilkumaranb/libcouchbase,mody/libcouchbase,avsej/libcouchbase,mnunberg/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,mnunberg/libcouchbase,kojiromike/libcouchbase,mody/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,signmotion/libcouchbase,senthilkumaranb/libcouchbase,avsej/libcouchbase,PureSwift/libcouchbase