Fix issue with ARM and RDFE cmdlets that share the same name/alias

[cormacpayne]

Description

Fix for #2917

A couple of cmdlets across ARM and RDFE share the same name, which requires -AllowClobber to be required when installing the modules from the gallery.

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[cormacpayne]

On-demand: http://azuresdkci.cloudapp.net/job/powershell-demand/1554/