Ethernet interface naming is not consistent on Linux.
While some USB ethernet dongles show up as eth0,
others might show up as usb0.

This CL changes config_ethernet_iface_regex to "*" which stands
for "use Android version specific default". The default will
include both usb\d+ and eth%d named interfaces on Android V+.
Android T/U will continue to only include eth%d interfaces
(note that the "+" is a new addition which is highly unlikely
to have any actual effect, but is more technically correct).

This reverts commit ac6ff00b
with change of U+ to V+ minimum.

Reason for revert: Change from U+ to V+

Test: TreeHugger
Bug: 304335605
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I124b8cd284968b920e753a8dcc270c22af46c9aa