adb: bump server version to prevent feature mismatch.

Devices get a list of supported features from the adb server, not the
client, so a mismatch between client and server features can cause the
device to use an incorrect feature set.

Bumping the server version is the easiest way to make sure the client
and server features match and seems like the best solution at the
moment.

A more automated fix could be to compare client/server features on each
connection and restart if they don't match. This requires an extra
client <-> server round-trip per command, but removes the need to
manually bump the server version number on feature change. Unless the
feature set changes often it didn't seem worth the extra overhead.

Bug: http://b/24370690
Change-Id: I4e43825d1c15c61e5d924fc8d4110b467debde37