Select-AzureRmSubscription: support tab-complete on subscription ID and tenant ID

[iouri-s]

It is always a hassle to select a subscription because all we can remember is a few characters from the beginning of the GUID. Auto-complete solves this issue.
Now a user can press to cycle through the subscriptions available to them.
Auto-complete for SubscriptionName would also be nice, but it's out of scope for this commit.

[azurecla]

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[azuresdkci]

Can one of the admins verify this patch?

[pcgeek86]

@iouri-s Check out the Azure PowerShell Extensions. It supports auto-completion for a bunch of different things, although subscriptions isn't there just yet. Because of the module's framework, it will be very easy to add this.

http://www.powershellgallery.com/packages/azureext

https://trevorsullivan.net/2016/04/23/azure-powershell-extensions-updates/

Cheers,
Trevor Sullivan
Microsoft MVP: PowerShell
https://trevorsullivan.net
https://twitter.com/pcgeek86

[hovsepm]

@azuresdkci add to whitelist

[iouri-s]

@pcgeek86 - thanks for the pointer, I'll check out the extensions. In this case, Login-AzureRmAccount already retrieves the list of user's subscription IDs. The change I made caches it for further use in the account property that already existed for that purpose and reuses it in Select-AzureRmSubscription.

[hovsepm]

@iouri-s please resolve merge conflicts.

[iouri-s]

Resolved merge conflicts.

[pcgeek86]

@iouri-s Good deal, that's useful! Thanks