Allow PO to enable network logging on work profile

Changes
* The profile owner can enable network logging
  on the work profile.
* The network logs only include work profile
  network activity (not personal profile activity).

Bug: 170460270
Test: atest com.android.server.devicepolicy.DevicePolicyManagerTest
      atest com.android.server.devicepolicy.NetworkEventTest
      atest com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testNetworkLogging
      atest com.android.cts.devicepolicy.MixedManagedProfileOwnerTest#testNetworkLogging
      atest com.android.cts.devicepolicy.DeviceOwnerTest#testNetworkLoggingWithTwoUsers
      atest com.android.cts.devicepolicy.DeviceOwnerTest#testNetworkLoggingWithSingleUser
      atest com.android.cts.devicepolicy.DeviceOwnerTest#testNetworkLogging_multipleBatches
Change-Id: I4727ba7cbc62f9cd187f82a9527f0475345fd555