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/config

@@ -0,0 +1,38 @@
+---
+username: 'oxidized'
+password: 'see ~/.creds/oxidized.env'
+model: powerconnect
+interval: 3600
+use_syslog: false
+debug: false
+threads: 30
+timeout: 20
+retries: 3
+prompt: !ruby/regexp /([\w.@-]+[#>]\s?)n/
+rest: 0.0.0.0:8888
+next_adds_job: false
+models: {}
+pid: /home/oxidized/.config/oxidized/pid
+log: /home/oxidized/.config/oxidized/logs/log
+snmp: false
+groups: {}
+models: {}
+resolve_dns: true
+interval: 3600
+output:
+  default: git
+  git:
+    user: oxidized
+    email: oxidized@tsys-librenms.knel.net
+    repo: /home/oxidized/.config/oxidized/git-repos
+source:
+  default: csv
+  csv:
+    file: /home/oxidized/.config/oxidized/router.db
+    delimiter: !ruby/regexp /:/
+    map:
+      name: 0
+      model: 1
+      username: 2
+      password: 3
+    gpg: false