Many changes in Billing
Changes:

* New Bill Package
ManageBill Test
Changes in Billing&Payment
ManageBill Test completed for newBillForPeriod method
Update in billing test
Change-Id: Ia94e9474df7b1281beb6f93679f019a0dcb6320b
Change-Id: I8fa344e1d0050ef269ab9d45c0e59b641b2501e0
Billing Changes
Change-Id: Ic4bbaeb936f41fa83b50d5d53dc4f913fe4676d6