Remove libcouchbase stuff

Change-Id: Ic725d3d3b797efd4a273284a4f54cd13156270e4
Reviewed-on: http://review.couchbase.org/28725
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Use recursive CMakeLists.txt

Change-Id: Idd0d390fda3864565e6590d549344138d0471eff
Build libconflate with cmake

Change-Id: I1040557f4679b0a38adebc20ff9712389c02d826
Build memcached with cmake

Change-Id: I742a660af7fb09335924fb44e69cbe97f1808159