Separation of build and test workflows

[farshidtz]

The test workflow with docker compose is meant for tests but the CI depends on it for the image builds

The build that is part of tests:

service-catalog/docker-compose.test.yml

Lines 6 to 11 in 36d3f4e

	build: # Build with versions. The CI relies on this
	context: .
	args:
	version: ${VERSION}
	buildnum: ${BUILDNUM}
	image: linksmart/sc

CI pushes assuming it was already built:

service-catalog/.travis.yml

Line 24 in 36d3f4e

script: docker push linksmart/sc:latest