Moving from NodeSlots to more coince way to count node resources

[sparshev]

This change introduces a new way to control the node resources - it's Alter & Overbook. In additional it's replacing the initial sh-based test framework by golang apitest-based.

• Label now can describe - does it like Multitenancy, allow CpuOverbook or RamOverbook: this allows to have different labels which could live with other ones on the same resource and reuse available resources.
• The drivers functionality was separated to make it easier to navigate the logic.
• Docker driver got IsRemote to notify Fish if the resources it's spending are actually on the other machine.
• Test framework was improved, none driver was renamed to test and got the similar functionality as local and remote drivers to be great for different kinds of testing.

WARN: In process the Label requirements was renamed to resources to unify requiring and collecting purpose of the struct.

Related Issue

Related: #15 Related: #12

How Has This Been Tested?

Automatically

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.