[ONOS-3203] End-to-end demo of Fault Management via SNMP.

This adds SNMP device-discovery, and a Fault Management app which makes alarms available to users via REST/GUI/CLI interfaces.
There is still code cleanup that could be done, but aim of this commit is an end-to-end proof of concept.

To demonstrate :

1) /opt/onos/bin/onos-service
onos> app activate org.onosproject.snmp
onos> app activate org.onosproject.faultmanagement

2) SNMP devices are seeded via config file. The default seed file contains connection details for devices (SNMP agents) available via internet  e.g. demo.snmplabs.com
cp /opt/onos/apache-karaf-3.0.3/etc/samples/org.onosproject.provider.snmp.device.impl.SnmpDeviceProvider.cfg   /opt/onos/apache-karaf-3.0.3/etc/

3) ONOS will poll these SNMP devices and store their alarms.

4) You can now manipulate the alarms via REST  e.g. http://<onos>:8181/onos/v1/fm/alarms , via CLI  via various "alarm-*” commands or in UI with an Alarms Overlay.

More info at https://wiki.onosproject.org/display/ONOS/Fault+Management

15/Dec/15: Updated regarding review comments from Thomas Vachuska.
17/Dec/15: Updated coreService.registerApplication(name) as per https://gerrit.onosproject.org/#/c/6878/

Change-Id: I886f8511f178dc4600ab96e5ff10cc90329cabec
diff --git a/tools/package/etc/samples/org.onosproject.provider.snmp.device.impl.SnmpDeviceProvider.cfg b/tools/package/etc/samples/org.onosproject.provider.snmp.device.impl.SnmpDeviceProvider.cfg
new file mode 100644
index 0000000..ac20d36
--- /dev/null
+++ b/tools/package/etc/samples/org.onosproject.provider.snmp.device.impl.SnmpDeviceProvider.cfg
@@ -0,0 +1,5 @@
+#
+# devices which support SNMP, these may support SNMP fault-management.
+# demo.snmplabs.com is a publically available SNMP agent-simulator accessible via the internet, see http://snmpsim.sourceforge.net/public-snmp-simulator.html
+#
+devConfigs =  bti7000:public@172.27.7.109:161:active,net-snmp:public@demo.snmplabs.com:161:active,net-snmp:public@demo.snmplabs.com:1161:active,net-snmp:public@demo.snmplabs.com:2161:active,net-snmp:public@demo.snmplabs.com:3161:active