CBD-697: Prepare build system for Apache CouchDB

The build system currently expects Couchbase. With this change
the make target changes. It's not longer just "make" or "make check",
but "make couchbase" and "make couchbase-check".

A message is printed out if "make" and "make check" is used.

Change-Id: Idc74b0926733f9ee430f6286b3946b3f56bd3694
Reviewed-on: http://review.couchbase.org/22991
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>