Gigamon GigaVUE basic support (#11824)

* Gigamon GigaVUE basic support

* delete os/gigavue.inc.php it is not used

Co-authored-by: Tony Murray <murraytony@gmail.com>

includes/definitions/gigavue.yaml

@@ -0,0 +1,13 @@
+os: gigavue
+text: 'GigaVUE'
+type: network
+icon: gigamon
+group: gigamon
+mib_dir: gigamon
+over:
+    - { graph: device_bits, text: 'Device Traffic' }
+    - { graph: device_processor, text: 'CPU Usage' }
+    - { graph: device_mempool, text: 'Memory Usage' }
+discovery:
+    - sysObjectID:
+        - .1.3.6.1.4.1.26866.3.1