Reverted Maven Sonar plugin version to 2.7.
Reverted Maven Sonar plugin version to 2.7.

jerrinot/hazelcast-stabilizer,hazelcast/hazelcast-simulator,hazelcast/hazelcast-simulator,pveentjer/hazelcast-simulator,jerrinot/hazelcast-stabilizer,hazelcast/hazelcast-simulator,Donnerbart/hazelcast-simulator,Donnerbart/hazelcast-simulator,pveentjer/hazelcast-simulator