Speedup breakdancer ~10x by splitting into 10 seperate suites

memcached-breakdancer-engine-tests currently takes ~4 minutes to
run. To allow it to complete in a faster wallclock time, split it into
10 seperate suites with a shared library for each, and run each one as
it's own test.

This reduces the wallclock time down to ~30s (with
CTEST_PARALLEL_LEVEL=8).

Change-Id: Ib72e8a513e7a198d10908747c346d133b6355bcd
Reviewed-on: http://review.couchbase.org/42669
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>