Indicate to 'cbas' process when cluster is IPv6

Change-Id: I898da2f1c89409d3affcb41441122da71752002d
Reviewed-on: http://review.couchbase.org/92508
Well-Formed: Build Bot <[email protected]>
Tested-by: Michael Blow <[email protected]>
Reviewed-by: Ajit Yagaty <[email protected]>

Author: mblow

src/ns_ports_setup.erl

@@ -709,6 +709,7 @@ cbas_spec(Config) ->
                      "-memoryQuotaMb=" ++ integer_to_list(MemoryQuota),
                      "-parentPort=" ++ integer_to_list(ParentPort),
                      "-bindReplicationPort=" ++ integer_to_list(ReplicationPort),
+                     "-ipv6=" ++ atom_to_list(misc:is_ipv6()),
                      "-logDir=" ++ LogDir
                     ] ++
                         ["-dataDir=" ++ Dir || Dir <- CBASDirs] ++