Add docker containers to test services.

This commit initializes the needed services which are not mocked
so tests can be executed in any environment with docker.

Some default modifications (i.e: connection strings) were also made to
current tests to accomodate them for this setup.

A docker-compose.yml file is provided with all the necessary parameters
for this services to be initialized. Future services can be added
easily by extending this configuration file

In addition a makefile has been introduced to simplify command execution

plugins/kafka_consumer/kafka_consumer_integration_test.go

@@ -14,6 +14,9 @@ import (
 )
 
 func TestReadsMetricsFromKafka(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
 	var zkPeers, brokerPeers []string
 
 	if len(os.Getenv("ZOOKEEPER_PEERS")) == 0 {