Nest all namespaces

The compiler supports this now.  We can type less going forward.
No functional changes.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I29d6fa4f9aacc0e381f1a7637294db0392466995
diff --git a/y2017/control_loops/superstructure/shooter/shooter.cc b/y2017/control_loops/superstructure/shooter/shooter.cc
index 8a2dcb9..135b089 100644
--- a/y2017/control_loops/superstructure/shooter/shooter.cc
+++ b/y2017/control_loops/superstructure/shooter/shooter.cc
@@ -4,10 +4,7 @@
 
 #include "aos/logging/logging.h"
 
-namespace y2017 {
-namespace control_loops {
-namespace superstructure {
-namespace shooter {
+namespace y2017::control_loops::superstructure::shooter {
 
 namespace chrono = ::std::chrono;
 using ::aos::monotonic_clock;
@@ -156,7 +153,4 @@
   return status_offset;
 }
 
-}  // namespace shooter
-}  // namespace superstructure
-}  // namespace control_loops
-}  // namespace y2017
+}  // namespace y2017::control_loops::superstructure::shooter