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/init_test.cpp b/init/init_test.cpp
index 7093ba9..0a4071b 100644
--- a/init/init_test.cpp
+++ b/init/init_test.cpp
@@ -27,6 +27,9 @@
 #include "keyword_map.h"
 #include "util.h"
 
+namespace android {
+namespace init {
+
 class TestFunctionMap : public KeywordMap<BuiltinFunction> {
   public:
     // Helper for argument-less functions
@@ -185,3 +188,6 @@
 
     EXPECT_EQ(6, num_executed);
 }
+
+}  // namespace init
+}  // namespace android