Updating Package version for ExpressRoute Commandlets

[nupurkot]

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[markcowl]

@nupurkot Tests? This should at least be covered by a unit test using Moq, or the like. Also, I assume this is targeted at the January release. LMK if not.

[nupurkot]

Modified the existing tests to also test BillingType. This is targeted for the January release.

[dihan0604]

LGTM

[markcowl]

on demand run here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-demand/425/