cVMSwitch: should support single adapter embedded teams

[dcuomo]

In the Test-TargetResource, SET is only enabled if there is -gt 1 adapter specified. There are a few reasons why customers would enable embedded teaming on a single adapter

Proposal: Add a new param (EmbeddedTeamingEnabled) to specify that this should be a SET team rather than the number of adapters.

if ($switch.EmbeddedTeamingEnabled)...