Adds use of N2VC.FormatApplicationName in collector

MonCollector was using its own method for generating the juju app name.
It is been replaced by the N2VC one that is also used by LCM on deployment.

Signed-off-by: Benjamin Diaz <bdiaz@whitestack.com>
Change-Id: Ic2a19825f055cc9b77404f8cf13152e5b6514214