Rename metering to Telemetry in user guide.

Change-Id: Ib8f07733eca388a48d28efe5f4a3c6af13b5c825
Change the name of Metering to new name Telemetry in install guide.

backport: havana
Change-Id: I45b9394f22e5dd630a505acd30685bb33dbb60fd
Merge "Change the name of Metering to new name Telemetry in install guide."
Merge "Rename metering to Telemetry in user guide."