#1107 Allow override of selenium containers and use real DinD info

[AndyGee]

Short description of what this resolves:

Adds better Docker in Docker (DinD) capability to the platform and allows enrichment of the static context of a test class. The selenium containers can also be overridden or modified.

Changes proposed in this pull request:

• Static context enrichment
• DinD resolution of containers that cannot be referenced by dockerhost, hostname or localhost.
• Enhanced Await strategies for DinD
• Overriding of Selenium container attributes using cubeSpecificProperties
• Docker network cleanup on failures
• Tests for new features
• Fix breaking tests on Win OS
• Multiple tweaks along the way

Fixes #1107

[AndyGee]

This is too big even for my liking - I'll close it and make a few smaller requests.