20210826 TICK - experimental branch - PR 3 of 3

Adds Chronograf and Kapacitor service definitions to complement Telegraf
and InfluxDB, and complete the TICK stack. Assumes Chronograf may be
added without Kapacitor (uncommenting relevant lines in Chronograf
service definition is required to enable full integration).

I made no attempt to create matching `build.js` and/or `config.js`
scripts.

Author: Paraphraser

.internal/templates/services/chronograf/template.yml

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+chronograf:
+  container_name: chronograf
+  image: chronograf:latest
+  restart: unless-stopped
+  environment:
+    - TZ=Etc/UTC
+  # see https://docs.influxdata.com/chronograf/v1.9/administration/config-options/
+    - INFLUXDB_URL=http://influxdb:8086
+  # - INFLUXDB_USERNAME=
+  # - INFLUXDB_PASSWORD=
+  # - INFLUXDB_ORG=
+  # - KAPACITOR_URL=http://kapacitor:9092
+  ports:
+    - "8888:8888"
+  volumes:
+    - ./volumes/chronograf:/var/lib/chronograf
+  depends_on:
+    - influxdb
+  # - kapacitor
+  networks:
+    - iotstack_nw

.internal/templates/services/kapacitor/template.yml

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+kapacitor:
+  container_name: kapacitor
+  image: kapacitor:1.5
+  restart: unless-stopped
+  environment:
+    - TZ=Etc/UTC
+  # see https://docs.influxdata.com/kapacitor/v1.6/administration/configuration/#kapacitor-environment-variables
+    - KAPACITOR_INFLUXDB_0_URLS_0=http://influxdb:8086
+  # - KAPACITOR_INFLUXDB_USERNAME=
+  # - KAPACITOR_INFLUXDB_PASSWORD=
+  # - KAPACITOR_HOSTNAME=kapacitor
+  # - KAPACITOR_LOGGING_LEVEL=INFO
+  # - KAPACITOR_REPORTING_ENABLED=false
+  ports:
+    - "9092:9092"
+  volumes:
+    - ./volumes/kapacitor:/var/lib/kapacitor
+  depends_on:
+    - influxdb
+  networks:
+    - iotstack_nw