Addressing issue #417.

[jlinenkohl]

This PR closes #417

The changes in this PR are as follows:

• Removed TryBalanceVmsPerHost from ClusterDrsConfigInfo spec when applying custom DRS settings via Set-CustomDRS.
• Also added some vscode specific .gitignore entries.

I have read the contributor guidelines and have completed the following:

• [ x] Formatted the code using VSCode default formatter for PowerShell.
• [ x] Tested the code end-to-end against an SDDC.
• [ x] Documented the functions using standard PowerShell markup and applied AVSAttribute to newly exported functions.

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[jlinenkohl]

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