The full batch will still be available to DPC if there were no
network logs pending.
Added some more debug logging to better investigate the issues.
Test: manual for both cases - pending batch was empty and non-empty,
with locally decreased timeout
Test: cts-tradefed run cts --module DevicePolicyManager --test com.android.cts.devicepolicy.DeviceOwnerTest#testNetworkLoggingWithSingleUser
Bug: 34157435
Bug: 29748723
Change-Id: Iee229d74d4b0a06025b305a15687f336a0aa337e