Overall goal: Build debug images for every stretch docker.
An earlier PR (#2789) made the first cut, by transforming broadcom/orchagent to build target/docker-orhagent-dbg.gz.
Changes in this PR:
Made docker-orchagent build to be platform independent.
1.1) Created rules/docker_orchagent.mk
1.2) Removed platform//docker-orchagent-*.mk
1.3) Removed the corresponding entry from platform//rules.mk
Extended the debug docker image build to stretch based syncd dockers.
2.1) For now, only mellanox & barefoot are stretch based.
2.2) All the common variable definitions are put in one place platform/template/docker-syncd-base.mk
2.3) platform/[mellanox, bfn]/docker-syncd-[mlnx, bfn].mk are updated as detailed below.
2.3.1) Set platform code and include template base file
2.3.2) Add the dependencies & debug dependencies and any update over what base template offers.
Extended all stretch based non-platform dockers to build debug dockers too.
3.1) Affected are:
docker-database.mk,
docker-platform-monitor.mk,
docker-router-advertiser.mk,
docker-teamd.mk,
docker-telemetry.mk
Next: Build debug flavor of final images with regular dockers replaced with debug dockers where available.
