Update to support custom init

[mdrafiur]

Picking changes in the following commit:

https://github.com/jboss-container-images/jboss-amq-7-broker-openshift-image/commit/c3cdfe59068b3f7ecc9ebbd87b30937bd599f5de

"Added some flags so that the launch script can be controlled by the flags to perform either configure or run the broker, or both (default when the flags are not set)"

https://issues.redhat.com/browse/ENTMQBR-4369

Signed-off-by: Rafiur Rashid rrashid@redhat.com

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