New cmdlets to create/enter PSSession in remote container app

[vinisoto]

Description

Adding cmdlets for Entering/Creating a PowerShell remote session into a Windows Containers web app

Design Review: https://github.com/Azure/azure-powershell-cmdlet-review-pr/issues/145

These changes where excluded from a previous PR

Followed recommendations from @MiYanni and have made changes to check for PowerShell version and make sure that we don't expect WSMAN when not running on Windows.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate change log has been updated
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • the changes have gone through a cmdlet design review
  • the cmdlet markdown files were generated using the platyPS module

FYI @jvano , @panchagnula

[adxsdkps]

Can one of the admins verify this patch?

[cormacpayne]

@azuresdkci add to whitelist

[vinisoto]

Skipped the test while investigation of PowerShell version in TRavis is ongoing. Opened this issue for tracking: #7440

[vinisoto]

Hi @MiYanni - since all checks have passed. Would you mind reviewing this? I have opened an Issue to track the issue where xUnit configuration is using PowerShell 6.0 instead of 6.1.

[MiYanni]

Need to add an entry for these changes to the Websites ChangeLog.md.

[vinisoto]

Thanks @MiYanni - updated the Changelog