CBLT-314:  use new package names:

    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86.rpm
    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86_64.rpm
    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86.deb
    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86_64.deb
    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86_64.tar.gz
    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86.exe
    couchbase-sync-gateway-${EDITION}_${BLD_NUM}_x86_64.exe

Change-Id: Ib388ba7446bfb10644402d3c2764916c93f77552
Reviewed-on: http://review.couchbase.org/38605
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>