Provisioning Network type constant

Added mertrics variable to network type used while provisioning.
Happens only once, when the device is provisioned.
It shouldn't be more than 10 times for a device's life.

Test: Not required

Bug: 31425625
Bug: 31425628

Change-Id: I5eccbda7ffd93f1bcceb37b8d485895598fa59a8