Move all the motors stuff into a saner namespace

Letting the mechanical engineers name software is never a good idea...

Change-Id: I5d0e43d84a8f45693435472cc0e5e288f6190b14
diff --git a/motors/big/medium_salsa.cc b/motors/big/medium_salsa.cc
index dc9d0a8..0bd4489 100644
--- a/motors/big/medium_salsa.cc
+++ b/motors/big/medium_salsa.cc
@@ -13,7 +13,7 @@
 #include "motors/util.h"
 
 namespace frc971 {
-namespace salsa {
+namespace motors {
 namespace {
 
 ::std::atomic<Motor *> global_motor{nullptr};
@@ -269,5 +269,5 @@
   return 0;
 }
 
-}  // namespace salsa
+}  // namespace motors
 }  // namespace frc971