Clean up BMCWEB_ENABLE_SSL

This macro came originally from CROW_ENABLE_SSL, and was used as a macro
to optionally compile without openssl being required.

OpenSSL has been pulled into many other dependencies, and has been
functionally required to be included for a long time, so there's no
reason to hold onto this macro.

Remove most uses of the macro, and for the couple functional places the
macro is used, transition to a constexpr if to enable the TLS paths.

This allows a large simplification of code in some places.

Tested: Redfish service validator passes.

Change-Id: Iebd46a68e5e417b6031479e24be3c21bef782f4c
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/http/routing/baserule.hpp b/http/routing/baserule.hpp
index 0913020..f99e16e 100644
--- a/http/routing/baserule.hpp
+++ b/http/routing/baserule.hpp
@@ -37,7 +37,6 @@
     virtual void handle(const Request& /*req*/,
                         const std::shared_ptr<bmcweb::AsyncResp>&,
                         const std::vector<std::string>&) = 0;
-#ifndef BMCWEB_ENABLE_SSL
     virtual void
         handleUpgrade(const Request& /*req*/,
                       const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
@@ -45,7 +44,7 @@
     {
         asyncResp->res.result(boost::beast::http::status::not_found);
     }
-#else
+
     virtual void handleUpgrade(
         const Request& /*req*/,
         const std::shared_ptr<bmcweb::AsyncResp>& asyncResp,
@@ -53,7 +52,6 @@
     {
         asyncResp->res.result(boost::beast::http::status::not_found);
     }
-#endif
 
     size_t getMethods() const
     {