Remove the black_magic namespace

The black_magic namespace has been eradicated of what most would call
"black magic" and while there's some non-trivial stuff in there, it's
far from the most complicated part of this stack.

This commit takes the two remaining things in the black_magic namespace,
namely the parameter tagging functionality, and moves them into the
utility namespace.

Tested: Redfish service validator passes

Change-Id: I9e2686fff5ef498cafc4cb83d4d808ea849f7737
Signed-off-by: Ed Tanous <edtanous@google.com>
diff --git a/test/http/router_test.cpp b/test/http/router_test.cpp
index 79320f7..edd9054 100644
--- a/test/http/router_test.cpp
+++ b/test/http/router_test.cpp
@@ -25,7 +25,7 @@
 namespace
 {
 
-using ::crow::black_magic::getParameterTag;
+using ::crow::utility::getParameterTag;
 
 TEST(Router, AllowHeader)
 {