Flip front/back and use team number for IP address

We tend to go to backwards buttons more often, and it's slightly more
natural to have front buttons on the left, so switch front/back

Also, both robots were controlling the 10.9.71.179 camera.  Point
them now at robot specific IP addresses.

Change-Id: I0b1c0152f62edae0453d44a614b927c40a4daf2e
diff --git a/y2018/constants.cc b/y2018/constants.cc
index 2ad0c97..70c58f0 100644
--- a/y2018/constants.cc
+++ b/y2018/constants.cc
@@ -135,7 +135,7 @@
 }
 
 const Values &DoGetValues() {
-  uint16_t team = ::aos::network::GetTeamNumber();
+  const uint16_t team = ::aos::network::GetTeamNumber();
   LOG(INFO, "creating a Constants for team %" PRIu16 "\n", team);
   return GetValuesForTeam(team);
 }