Build optimizations (#883)

A few specific build optimizations:

1. Consolidated `dockerComposeUp` to only use a single `root/docker/docker-compose.yml` instead of each module having its own docker-compose files.  This eliminates additional waits for docker containers to startup and stop, as well as reduces memory consumption during the build
2. Cleaned up `VinylDNSSpec` - I noticed that this spec was taking 3 minutes to run!  I discovered that the way we were mocking the `WSClient` was largely to blame.  Was able to get tests to run in **16 SECONDS** using a library called `mock-ws`.  This is where we see most savings.
3. Added back `dynamodb-local` instead of running it in `localstack`.  Integration tests for dynamodb were very slow in localstack.  This added an additional 20-30 second improvement.

After doing several tests locally running the following command...

```
> SECONDS=0; sbt verify; echo "DURATION = $SECONDS SECONDS"
```

Current master took 535 seconds to run; with these optimizations it took **211 SECONDS** - that is a 60% improvement.

The initial Travis builds reported a run time of 13 minutes as opposed to 19 minutes; this would save some 6 minutes off of Travis build times (or 30% improvement).

project/Dependencies.scala

@@ -117,6 +117,7 @@ object Dependencies {
     "io.netty"                  %  "netty-transport-native-unix-common" % "4.1.37.Final" % "test",
     "com.nimbusds"              % "oauth2-oidc-sdk"                 % "6.5",
     "com.nimbusds"              % "nimbus-jose-jwt"                 % "7.0",
-    "co.fs2"                    %% "fs2-core"                       % fs2V
+    "co.fs2"                    %% "fs2-core"                       % fs2V,
+    "de.leanovate.play-mockws"  %% "play-mockws" % "2.7.1"          % "test"
   )
 }