Upgrading spymemcached to 2.8.10.

Note, this is a prerequisite to the fix for JCBC-214.  There was
one fix at the SPY project level related to detecting failures.

Change-Id: Ia377f28e7c98e9b9f5c01f7d255e0be523cc41d1
Reviewed-on: http://review.couchbase.org/23986
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Matt Ingenthron <matt@couchbase.com>