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/util.cpp b/init/util.cpp
index 75f81b9..4b1894f 100644
--- a/init/util.cpp
+++ b/init/util.cpp
@@ -50,6 +50,9 @@
 using android::base::boot_clock;
 using namespace std::literals::string_literals;
 
+namespace android {
+namespace init {
+
 // DecodeUid() - decodes and returns the given string, which can be either the
 // numeric or name representation, into the integer uid or gid. Returns
 // UINT_MAX on error.
@@ -397,3 +400,6 @@
     }
     return false;
 }
+
+}  // namespace init
+}  // namespace android