ethernet: add test for removing interface while in server mode

Bug: 236892130
Bug: 252963267
Test: atest EthernetManagerTest#testRemoveInterface_whileInServerMode
Change-Id: I3ca71cd87301da8e96d31f7632b69d318ee97d4a
(cherry picked from commit f34945bf6f7e1db2b4361f4938f5d2a35bc23707)
Merged-In: I3ca71cd87301da8e96d31f7632b69d318ee97d4a
1 file changed