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/property_service.h b/init/property_service.h
index 9251722..a55e79c 100644
--- a/init/property_service.h
+++ b/init/property_service.h
@@ -21,6 +21,9 @@
 
 #include <string>
 
+namespace android {
+namespace init {
+
 struct property_audit_data {
     ucred *cr;
     const char* name;
@@ -36,5 +39,7 @@
 uint32_t property_set(const std::string& name, const std::string& value);
 bool is_legal_property_name(const std::string& name);
 
+}  // namespace init
+}  // namespace android
 
 #endif  /* _INIT_PROPERTY_H */