test module name is based on component name

also "_tests" suffix is redundant. it's already part of "tests"
package.

Change-Id: Icac4d9f91568e38f289943234c3962836dd7bf60
Reviewed-on: http://review.couchbase.org/36773
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Li Yang <lichenyang2@gmail.com>