Add CtsHostsideNetworkTests to postsubmit. am: 5f0ddbdf4e am: cc20c67ced

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/3255363

Change-Id: I8d28e88500529abe6aedd21361f4ecf734cb08f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>