remove converger and add cfdot to `scripts/sync-submodule-config`
remove converger and add cfdot to `scripts/sync-submodule-config`

Signed-off-by: Brandon Shroyer <d370be3f39cb88690ed16d1a7b77debc20949e86@pivotal.io>

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release