append_t: Newer server build returns ENOENT rather than NOT_STORED
append_t: Newer server build returns ENOENT rather than NOT_STORED

The latest builds of the server return this error code (which is
actually more correct anyway).

Change-Id: I47390e048857b92113b01bf11dab9909bf31732c
Reviewed-on: http://review.couchbase.org/38222
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>
Reviewed-by: Volker Mische <fb414f8ac0dbbf87663550ae4ef5fc95b1041941@gmail.com>

mnunberg/couchbase-python-client,couchbase/couchbase-python-client,couchbase/couchbase-python-client,mnunberg/couchbase-python-client