Create Unit tests for Rubrik Vcenter and Setting functions

[jaapbrasser]

There are currently no unit tests for these functions, proper unit tests should be written for these functions so we can make this part of the CI/CD pipeline. This will provide more confidence when writing additional functionality or fixing bugs in the module.

Unit tests should be created for the following functions:

• New-RubrikLDAP
• Get-RubrikVCenter
• New-RubrikVCenter
• Remove-RubrikVCenter
• Set-RubrikVCenter
• Update-RubrikVCenter
• Get-RubrikSetting
• Set-RubrikSetting
• New-RubrikHost
• Remove-RubrikHost

Describe alternatives you've considered

Manually testing function when adding functionality

[jaapbrasser]

Fixed in #597