Voltha Alarm Management using OpenNMS and Elasticsearch
- Added necessary configuration to run a self-contained instance of
  OpenNMS
- Elasticsearch/Logstash is responsible for the interception of voltha
  alarms and to forward to OpenNMS

Amendment:
- Cleaned up untouched opennms config files
- Added Dockerfile and scripts to override the default entrypoint script

Change-Id: Id611a330f7274d016281e734ade79d22bfc0356b
diff --git a/compose/opennms/env/opennms_start.sh b/compose/opennms/env/opennms_start.sh
new file mode 100644
index 0000000..0b1ea0e
--- /dev/null
+++ b/compose/opennms/env/opennms_start.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# Initialize the OpenNMS environment and generate necessary configuration files
+/docker-entrypoint.sh -i
+
+# Replace default configuration with customized files
+cp -r /tmp/opennms/etc/* /opt/opennms/etc
+
+# Start OpenNMS
+/docker-entrypoint.sh -f
\ No newline at end of file