Pykeadhcp

What's Changed
* Prerelease testing for v0.7.0a2 by BSpendlove in https://github.com/BSpendlove/pykeadhcp/pull/49


**Full Changelog**: https://github.com/BSpendlove/pykeadhcp/compare/v0.6.0...v0.7.0a2

**Full Changelog**: https://github.com/BSpendlove/pykeadhcp/compare/v0.5.1...v0.6.0

Implements basic configuration backend API calls for dhcp4 daemon along with the relevant tests 25

Also the docker test environment has been improved drastically and documentation will be updated to reflect the changes and how to setup an optimal developer environment when working with the premium hooks in v0.6.0 release.

- Addresses issue 23
- Further tests for lease get-all dhcp4 and dhcp6 daemons

- Basic Dhcp6 Daemon Parser test implemented
- Updated Dhcp4 and Dhcp6 API configs to include client-classes to test local parsing
- Addressed issue 20