Write the clang-tidy file OpenBMC needs

Now that CI can handle clang-tidy, and a lot of the individual fixes
have landed for the various static analysis checks, lets see how close
we are.

This includes bringing a bunch of the code up to par with the checks
that require.  Most of them fall into the category of extraneous else
statements, const correctness problems, or extra copies.

Tested:
CI only.  Unit tests pass.

Signed-off-by: Ed Tanous <ed@tanous.net>
Change-Id: I9fbd346560a75fdd3901fa40c57932486275e912
diff --git a/include/http_utility.hpp b/include/http_utility.hpp
index e0166e3..d282a28 100644
--- a/include/http_utility.hpp
+++ b/include/http_utility.hpp
@@ -19,7 +19,7 @@
         {
             return true;
         }
-        else if (encoding == "application/json")
+        if (encoding == "application/json")
         {
             return false;
         }