Adds RADIUS Authentication Support

[iainbrighton]

Description

Adds support for RADIUS authentication servers

Related Issue

Issue #90

Motivation and Context

How Has This Been Tested?

Used to deploy production NetScaler appliances Units tests run locally

Tests completed in 107.97s
Tests Passed: 3727, Failed: 0, Skipped: 1, Pending: 0, Inconclusive: 0

Screenshots (if appropriate):

Types of changes

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

Checklist:

• [x] My code follows the code style of this project.
• [ ] 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.

[iainbrighton]

@devblackops Is there any chance of reviewing this PR? I have some other updates to submit too but wanted to wait for this one to be merged. Thanks, Iain

[devblackops]

Sorry I dropped the ball on this!