Modified getActiveAdminsForAffectedUser

* Removed parent parameter from method.
* If user is a managed profile, return active admins for that user.
* If user is not a managed profile, then add all the active admins
  for that user and the parent active admins of managed profiles
  associated with it.

Bug: 149461308
Test: atest com.android.server.devicepolicy.DevicePolicyManagerTest
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testAdminConfiguredNetworks
      atest com.android.cts.devicepolicy.MixedDeviceOwnerTest#testSetCameraDisabledLogged
      atest com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testAdminConfiguredNetworks
      atest com.android.cts.devicepolicy.OrgOwnedProfileOwnerTest#testCameraDisabledOnParentLogged

Change-Id: I3a4f9dd9f43c1acd7115aede6d26bb288b110c80