Allow specifying the multicast IP for Hazelcast in Bitbucket Data Center

Our network only allows multicast to work on specific IPs. We want to leverage multicast to dynamically add members to the pool, but need to specify the multicast IP.

In Confluence this is done in confluence.cfg.xml as the "confluence.cluster.address". However, the bitbucket.properties file doesn't have a documented parameter to do this.

Including such a configuration on Bitbucket would be beneficial