Update RedfishVersion to 1.17.0

The latest version of the specification is 1.17.0, and arguably, we
should be updating this every time we pull in any new feature, but that
hasn't happened.

So far as I'm aware, there are no tools that actually look at this
parameter to make branching decisions in the client about supported
features, so the likelihood this has impact is basically nil.

Tested:
GET /redfish/v1 returns RedfishVersion of 1.17.0

Redfish service validator passes.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I055b6010329599b7b39c587fa85faf51a38c9b57
diff --git a/redfish-core/lib/service_root.hpp b/redfish-core/lib/service_root.hpp
index a72a03e..d94f446 100644
--- a/redfish-core/lib/service_root.hpp
+++ b/redfish-core/lib/service_root.hpp
@@ -53,7 +53,7 @@
     asyncResp->res.jsonValue["@odata.id"] = "/redfish/v1";
     asyncResp->res.jsonValue["Id"] = "RootService";
     asyncResp->res.jsonValue["Name"] = "Root Service";
-    asyncResp->res.jsonValue["RedfishVersion"] = "1.9.0";
+    asyncResp->res.jsonValue["RedfishVersion"] = "1.17.0";
     asyncResp->res.jsonValue["Links"]["Sessions"]["@odata.id"] =
         "/redfish/v1/SessionService/Sessions";
     asyncResp->res.jsonValue["AccountService"]["@odata.id"] =