Replacing IIpClient with Manager in ethNetFactory am: cfa7a08bcf am: 7d4d068293 am: 4b44c9f94d

Original change: https://android-review.googlesource.com/c/platform/frameworks/opt/net/ethernet/+/1935877

Change-Id: I3259052708de60d671860f0909bf4d580bd778ec
tree: 086c6ae2487ac66151330989710185bb07933406
  1. service-t/
  2. tests/