Infracheck

--------

* Docker: Fixed containers - added missing gcc after adding dependency that requires compilation
* Added correct requirements.txt
* Tests: Corrected paths in tests
* Checks: Add swap-usage-max-percent
* Checks: Added load-average and load-average-auto

--------

* CI: Increased timeout for SSH container
* CI: Added missing make task
* CI: debug
* CI: Fix build by allowing running in venv
* CI: Fix build by allowing running in venv
* Docs: Added all new checks to docs
* Docs: Fixed errors in the docs
* Added new check - \`ssh-files-checksum\`: \`Calls remote process using SSH and expects: the listed files and checksums will be matching\`
* SSH-based checks are now sharing the same code by using a library, simplified imports and made them more safe
* Runner: Added support for lists and dicts in parameters
* Add \`ssh-fingerprint\` check: \`Verifies if remote host fingerprint matches. Helps detecting man-in-the-middle and server takeover attacks.\`
* Tests: Close the docker socket to avoid warnings in tests
* Tests: Separate unit tests from functional tests, improve pipeline - correct mistake
* Tests: Separate unit tests from functional tests, improve pipeline

--------

* Tests: Improved tests that uses SSH container - the container is setup one for a class
* Tests: Collecting output from SSH container
* Refactored "replication-running" check syntax and added additional status information
* CI: Attempt to run unit tests on travis
* CI: Trying to bring up the unit tests
* Covered "reminder" check with tests
* CI: Fixing Python 3.7 build
* CI: Add missing pipenv
* Add compatibility with Python 3.7 stage
* Downgrade packages for Python 3.6 compatibility
* No longer require strict Python version, correct Docker builds
* Corrected mistake in travis configuration
* Changing the way the application is deployed. Introducing pipenv
* Enabled docker in travis builds as it is required for testing
* Covered "ssh-command" with tests and fixed all spotted bugs
* Preparation for the Pipenv support
* Updated documentation for requirements
* Added documentation for "reminder" check
* Added ssh-command
* Added "reminder" check that should remind about upcoming dates
* Docker: Fixed typo in entrypoint

------

* Cleared username from cron entry
* Restored /etc/crontabs/root as it was previously working
* Unified docker images to base on same OS - Alpine 3.9: Do not have to support two cron types
* Unified docker images to base on same OS - Alpine 3.9
* Correct crontab support to be compatible with multiple cron systems
* Corrected ARM dockerfile by adding supervisord config file

----

* Makefile: Switched shell to bash
* CI: Fixed typo
* Moving to Travis
* Fixed documentation styling for new check
* Added retry support
* Added ovh-expiration check
* Refactored - moved infrastructural things to separate directory, added Slack notifications

------

* Bugfix: The CHECK\_INTERVAL expression was evaluated, but it should not