Add new metrics to rkpd for Android U

1. Add certificate chain length and root info to ProvisioningAttempt
2. Add RkpdClientOperation metric to track the status of every single
   client call into rkpd
3. Periodically report the pool stats so we can get a picture of the
   health of the key pools of devices in the field

Bug: 266509149
Bug: 268247931
Test: RkpdAppIntegrationTests RkpdAppUnitTests RkpdAppStressTests
Change-Id: I1c277271429478bcc6b989e1ac676be1645ce8a2
8 files changed
tree: b28006d6cca843d2e7f86fe784cda63f239e4d3a
  1. apex/
  2. app/
  3. system-server/
  4. OWNERS
  5. PREUPLOAD.cfg