Add automatic module name

[afloarea]

Signed-off-by: afloarea adrianfloarea07@yahoo.com

Motivation:

Add automatic module name as per vert-x3/issues#524

NOTE / FYI: on mvn clean package -DskipTests compilation failed with:

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.7.0:compile (default-compile) on project vertx-circuit-breaker: Compilation failure
[ERROR] /home/afloarea/Repositories/vertx/vertx-circuit-breaker/src/main/java/io/vertx/circuitbreaker/impl/CircuitBreakerMetrics.java:[29,82] cannot find symbol
[ERROR]   symbol:   method getNodeID()
[ERROR]   location: interface io.vertx.core.spi.cluster.ClusterManager

The line that caused the issue:

this.node = vertx.isClustered() ? ((VertxInternal) vertx).getClusterManager().getNodeID() : "local";

In order to test that the jar had the automatic module name I temporarily changed the line to this.node = "local"