test(DCOS-14460): Implement integration tests for Service modal.
test(DCOS-14460): Implement integration tests for Service modal.

This PR implements integration tests for Service modal where two units are included in this commit, testing for
horizontally/vertically centered and lastly test if panels contain same size (width/height).

dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui,dcos/dcos-ui