Add cred mng app metrics to DPMS

Log:
* install key pair failed
* generate key pair failed

Bug: 165641221
Test: atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testInstallKeyPairLogged
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testGenerateKeyPairLogged
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSetKeyPairCertificateLogged
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testInstallKeyPairLogged

Change-Id: I38da724cae7edb06b9a2848f39125f3c488bf407