New flags make systemd unit wait for activemq ports or logs

[guidograzioli]

The new variable, enabled by default when ha is enabled, adds a configuration to the systemd unit so that service start/restart commands return only after ports are open / console log line

Variable	Description	Default
activemq_systemd_wait_for_port	Whether systemd unit should wait for activemq_port before returning	True when activemq_ha_enabled is True and activemq_shared_storage is False
activemq_systemd_wait_for_log	Whether systemd unit should wait for service to be up in logs	True when activemq_ha_enabled and activemq_shared_storage are True