init: create android::init:: namespace

With some small fixups along the way

Test: Boot bullhead
Test: init unit tests
Change-Id: I7beaa473cfa9397f845f810557d1631b4a462d6a
diff --git a/init/watchdogd.cpp b/init/watchdogd.cpp
index 7baa487..e0164b4 100644
--- a/init/watchdogd.cpp
+++ b/init/watchdogd.cpp
@@ -31,6 +31,9 @@
 
 #define DEV_NAME "/dev/watchdog"
 
+namespace android {
+namespace init {
+
 int watchdogd_main(int argc, char **argv) {
     InitKernelLogging(argv);
 
@@ -73,3 +76,6 @@
         sleep(interval);
     }
 }
+
+}  // namespace init
+}  // namespace android