Revert "Add SkipPresubmit to EthernetManagerTest"

This reverts commit c2bc2963c19aeb5b25ffd09c5d4bec5166216db4.

Reason for revert: fixed flakiness. Re-enable EthernetManagerTest in presubmit.

Change-Id: I29f7d2b4f530b18aaaae3e327f3721f08aab060a
1 file changed