indexer: Read all indexer port numbers through cmdline params

ns_server will startup indexer with all required port numbers

Change-Id: If7001b7f322ad9aa2fc1149b8f38a79d7606beac
Reviewed-on: http://review.couchbase.org/44090
Reviewed-by: Pratap Chakravarthy <prataprc@couchbase.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>