Add initial OS detection for LoadBalancer.org (#14902)

* Add initial OS detection for LoadBalancer.org

* Match on Linux sysObjectID first for efficiency

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

* Add test for loadbalancer OS detection

* Add test for loadbalancer OS detection - fix author

* Add test for loadbalancer OS detection

* Add test for loadbalancer OS detection - fix author

---------

Co-authored-by: Tony Murray <murraytony@gmail.com>
Co-authored-by: Chris Ware <cjw26@bath.ac.uk>

html/images/os/loadbalancer.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 5.928 5.159"><defs><linearGradient gradientTransform="matrix(.26458 0 0 .26458 35.96 94.77)" xlink:href="#a" id="b" x1="-.422" y1="-31.147" x2="22.385" y2="-17.067" gradientUnits="userSpaceOnUse"/><linearGradient id="a"><stop offset="0" style="stop-color:#e707e9;stop-opacity:1"/><stop offset="1" style="stop-color:#00eba7;stop-opacity:1"/></linearGradient></defs><path style="fill:url(#b);fill-opacity:1;stroke-width:.02480404" d="M38.157 88.123v-.46h.918v.919h-.918zm-1.686-1.265v-1.724h.918v3.448h-.918zm3.373 1.302v-1.265H38.157v-2.629h.918V85.977H40.762v3.448h-.918zm-5.01-.459v-1.724h.918v3.448h-.918z" transform="translate(-34.834 -84.266)"/></svg>

includes/definitions/loadbalancer.yaml

@@ -0,0 +1,19 @@
+os: loadbalancer
+text: 'Loadbalancer.org'
+type: loadbalancer
+icon: loadbalancer
+over:
+    - { graph: device_bits, text: 'Device Traffic' }
+    - { graph: device_processor, text: 'CPU Usage' }
+    - { graph: device_mempool, text: 'Memory Usage' }
+discovery:
+    -
+        sysObjectID: .1.3.6.1.4.1.8072.3.2.10
+        snmpget:
+          oid: .1.3.6.1.4.1.54849.1.1.4.0
+          op: '!='
+          value: false
+poller_modules:
+    loadbalancers: true
+discovery_modules:
+    loadbalancers: true

tests/data/loadbalancer_vm.json

@@ -0,0 +1,23 @@
+{
+    "os": {
+        "discovery": {
+            "devices": [
+                {
+                    "sysName": "<private>",
+                    "sysObjectID": ".1.3.6.1.4.1.8072.3.2.10",
+                    "sysDescr": "Linux lbhost 4.9.182-lb1 #1 SMP Wed Jun 19 13:36:05 BST 2019 x86_64",
+                    "sysContact": "<private>",
+                    "version": null,
+                    "hardware": null,
+                    "features": null,
+                    "location": "<private>",
+                    "os": "loadbalancer",
+                    "type": "loadbalancer",
+                    "serial": null,
+                    "icon": "loadbalancer.svg"
+                }
+            ]
+        },
+        "poller": "matches discovery"
+    }
+}