MB-100: fix hardcoded test_conf

Change-Id: I67400dc2feb676b4a7eab7df4df08840d3a9b923
Reviewed-on: http://review.couchbase.org/23936
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>
MB-100: check erlang_threads in setup script

Change-Id: I07c5a33a7a26de7223b815aeccd9048312ffc949
Reviewed-on: http://review.couchbase.org/23937
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>
Tested-by: Pavel Paulau <pavel.paulau@gmail.com>