Description

This returns the status returned by the memcache server. When Error() is non-nil, this value may not be valid.

NOTE: 1. For stat request, this returns the first non-StatusNoError encountered

(or StatusNoError if there were no errors).

2. If the client is sharded, flush/stats/version/verbosity requests

will return the first non-StatusNoError encountered (or StatusNoError
if there were no errors).