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/redfish-core/lib/roles.hpp b/redfish-core/lib/roles.hpp
index 610c086..de2e1ff 100644
--- a/redfish-core/lib/roles.hpp
+++ b/redfish-core/lib/roles.hpp
@@ -28,15 +28,15 @@
     {
         return "Administrator";
     }
-    else if (priv == "priv-user")
+    if (priv == "priv-user")
     {
         return "ReadOnly";
     }
-    else if (priv == "priv-operator")
+    if (priv == "priv-operator")
     {
         return "Operator";
     }
-    else if (priv == "priv-noaccess")
+    if (priv == "priv-noaccess")
     {
         return "NoAccess";
     }