Fix typo in spymemcached-test ivy config for junit.

Change-Id: Iccbc0367a89a09e0401d57a9fda6df115a928e27
Reviewed-on: http://review.couchbase.org/25657
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Deepti Dawar <deepti.dawar@globallogic.com>