Puppetboard

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* Added support for new metrics API `v2` on PuppetDB >= `5.3.11` and < `6.0.0` (558)
* Added Python 3.5 back into test matrix (559)
* Fixed bug in `dailyreport.js` that caused it not to render when served under a non-default virtual host (557)

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* Fixed Puppetboard's usage for the new metrics v2 API both on the home page for computing the average resources/node and the `Metrics` listing page. This change now supports the changes in PuppetDB >= 6.9.1 (https://puppet.com/security/cve/CVE-2020-7943/)
* Added backwards compatability support for both the metric `v1` and `v2` endpoints
depending on the version of the server. Any PuppetDB >= `6.9.1` will be queried with
the `v2` endpoint automatically (because `v1` is disabled from here forward). Any
PuppetDB <= `6.9.0` will use `v1`.
* pypuppetdb: raise version requirement `>=2.1.0` because changes were needed in this library to support the metrics v2 fixes.
* app.py: Added python2 backwards compatability fix for importing `urllib`.

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* Dockerfile: Switch to python:3.7-alpine image
* pypuppetdb: raise version requirement `>=1.2.0` to `>=2.0.0`
* Drop support for python2.7 and python3.5 & Add python3.8 to buildmatrix
* Upgrade of tests requirements + resolving current deprecation warnings
* Ignore facts environment for compatibility and performance
* Adding mypy + Cleanup + CommonMark upgrade to 0.9.1
* Update docker and fix coveralls not running.
* Cast inventory data toString

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* Move to Python 3.6 for Docker
* Fix problem loading daily chart on node page
* fix gunicorn parameter and allow to define workers in docker
* Add feature for better performance in big Puppet envs
* bundle requirements.txt for tests and docker

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* CI enhancements
* Allow to configure which PuppetDB endpoints are allowed
* Update c3 to 4.22
* Add basic health check endpoint
* Allow to force the PuppetDB connection protocol
* Update jquery-tablesort to 0.0.11
* Fix bug breaking date/time sort
* Fix formatvalue for list of dicts
* Modify date sort to handle failed
* Include template files for altering Semantic css and Google fonts
* Make 320px the max width for columns
* If query is None don't perform add on it
* Query using producer\_timestamp index vs. start\_time
* Add missing components for building source packages
* Add support for URL prefixes to Docker image

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* Core UI Rework
* Update to pypuppetdb 0.3.3
* Fix sorty on data for index
* Update debian documentation
* Offline mode fix
* Fix fact attribute error on paths
* Enhanced testing
* Radiator CSS uses same coloring
* Markdown in config version
* Update Flask
* Cleanup requirements.txt
* Update package maintainer for OpenBSD