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/keyword_map.h b/init/keyword_map.h
index 88bad01..481d637 100644
--- a/init/keyword_map.h
+++ b/init/keyword_map.h
@@ -22,6 +22,9 @@
 
 #include <android-base/stringprintf.h>
 
+namespace android {
+namespace init {
+
 template <typename Function>
 class KeywordMap {
   public:
@@ -79,4 +82,7 @@
     virtual const Map& map() const = 0;
 };
 
+}  // namespace init
+}  // namespace android
+
 #endif