Update Get-DNSCache.ps1

Hide Get-Command error message.
Add -ErrorAction SilentlyContinue to Get-Command

Double Check the logic for Get-Reg and LogUserAssist (they're the same)
I think I did that right, but you're the boss.
Revert "Update Get-DNSCache.ps1"

This reverts commit a9aecff32e7bb78996e23febb51fbac55174a6f0.

Conflicts:
	Modules/Net/Get-DNSCache.ps1
Merge pull request #22 from hacksauce/patch-1

Fix Get-Command error messages