Move logging level to WARNING for 404

These are 4xx errors, 404 not found. Move the logging to WARNING so they
don't log unless WARNING level is enabled. This follows the guidance in
the commit below.

Tested: None.

Change-Id: I38b2bec64507d75286f79d61acf7a96226598e0b
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/redfish-core/lib/power.hpp b/redfish-core/lib/power.hpp
index 7dbf660..5d7bbb7 100644
--- a/redfish-core/lib/power.hpp
+++ b/redfish-core/lib/power.hpp
@@ -39,7 +39,7 @@
             const std::optional<std::string>& chassisPath) mutable {
         if (!chassisPath)
         {
-            BMCWEB_LOG_ERROR << "Don't find valid chassis path ";
+            BMCWEB_LOG_WARNING << "Don't find valid chassis path ";
             messages::resourceNotFound(sensorsAsyncResp->asyncResp->res,
                                        "Chassis", sensorsAsyncResp->chassisId);
             return;
@@ -47,7 +47,7 @@
 
         if (powerControlCollections.size() != 1)
         {
-            BMCWEB_LOG_ERROR << "Don't support multiple hosts at present ";
+            BMCWEB_LOG_WARNING << "Don't support multiple hosts at present ";
             messages::resourceNotFound(sensorsAsyncResp->asyncResp->res,
                                        "Power", "PowerControl");
             return;