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/ueventd.cpp b/init/ueventd.cpp
index 2fd8058..81a0572 100644
--- a/init/ueventd.cpp
+++ b/init/ueventd.cpp
@@ -99,6 +99,9 @@
 // the uevent listener resumes in polling mode and will handle the uevents that occurred during
 // coldboot.
 
+namespace android {
+namespace init {
+
 class ColdBoot {
   public:
     ColdBoot(UeventListener& uevent_listener, DeviceHandler& device_handler)
@@ -273,3 +276,6 @@
 
     return 0;
 }
+
+}  // namespace init
+}  // namespace android