chore: initial import from KNEL/PFVCluster@041d311 [#769]

Split per O&M lane work order. Full history: KNEL/PFVCluster.
shellcheck debt fixed in librenms-agent (quoting, arithmetic, backticks);
fixes upstream ntp-server.sh bug: input_wakeups reported PACKETSENDFAILURES
instead of INPUTWAKEUPS. mysql.sh (PHP-in-.sh) exempt per house rule.

https://projects.knownelement.com/issues/769#note-4152

oxidized/docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  oxidized:
+    image: oxidized/oxidized:0.30.1
+    container_name: oam-oxidized
+    environment:
+      - OXIDIZED_CONFIG=/home/oxidized/.config/oxidized/config
+      - TZ=America/Chicago
+    volumes:
+      - /opt/oam/oxidized/config:/home/oxidized/.config/oxidized
+    ports:
+      - "8083:8888"
+    restart: unless-stopped