Change the cert parsing debugging logs to be more meaningful and less

noisy

Test: adb shell am instrument -w -e package \
com.android.server.locksettings.recoverablekeystore \
com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner

Change-Id: Iee92d0c3fdea597e6ba4c9471554082360a724c7