PowerShellGet 3.0/PowerShellGallery should work with legacy TLS

[SydneyhSmith]

We should add this to 3.0 interaction with the Gallery and incorporate legacy TLS into our testing: [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

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[SydneyhSmith]

We are also considering adding a warning to update to TLS 1.2 instead

[StevenBucher98]

@alerickson is there a way to check if the issue is caused by the TLS issue and then be able to send a warning/error messaged based on that?