Changing hostname for logstash

When you make changes to the hostname and service name for logstash, they are not pushed to the internal PostgreSQL container. For example, you might want to change the logstash hostname to bdlogstash because you're using logstash for another purpose and you now want to write PostgreSQL logs to bdlogstash; make the following changes:

1. In blackduck-config.env change logstash to bdlogstash HUB_LOGSTASH_HOST=bdlogstash.

2. Edit docker-compose.yml and change logstash to bdlogstash.

   bdlogstash:

   image: blackducksoftware/blackduck-logstash:1.0.9
   volumes: ['log-volume:/var/lib/logstash/data']
   env_file: [blackduck-config.env]

3. Add env_file: [blackduck-config.env] to the postgres container definition in docker-compose.yml so that it reads the hostname change.

   env_file: [blackduck-config.env]