MB-6899: start mb_master before menelaus_sup
MB-6899: start mb_master before menelaus_sup

So that we in initial startup we can upgrade cluster compat before
anybody can see lack of couchApiBase and 2.0 compatibility.

Change-Id: I828f55a011d867c71259e24d6401c7be4e4c7b02
Reviewed-on: http://review.couchbase.org/21603
Tested-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>
Reviewed-by: Aliaksey Artamonau <3c875bcfb3adf2a65b2ae7686ca921e6c9433147@gmail.com>
Reviewed-by: Aliaksey Kandratsenka <340b8e09ca65cd3fc686427fcfed17e87eaf61e2@gmail.com>

ceejatec/ns_server,daverigby/ns_server,ceejatec/ns_server,ceejatec/ns_server,membase/ns_server,ceejatec/ns_server,pavel-blagodov/ns_server,vzasade/ns_server,nimishzynga/ns_server,membase/ns_server,pavel-blagodov/ns_server,mschoch/ns_server,nimishzynga/ns_server,mschoch/ns_server,mschoch/ns_server,daverigby/ns_server,membase/ns_server,t3rm1n4l/ns_server,nimishzynga/ns_server,mschoch/ns_server,t3rm1n4l/ns_server,t3rm1n4l/ns_server,daverigby/ns_server,nimishzynga/ns_server,membase/ns_server,t3rm1n4l/ns_server,vzasade/ns_server,nimishzynga/ns_server,pavel-blagodov/ns_server,nimishzynga/ns_server,membase/ns_server,mschoch/ns_server,pavel-blagodov/ns_server,membase/ns_server,vzasade/ns_server,ceejatec/ns_server,vzasade/ns_server,t3rm1n4l/ns_server,mschoch/ns_server,daverigby/ns_server,daverigby/ns_server,ceejatec/ns_server