H2O: Increase the number of database connections (#4948)

This change affects the physical hardware environment.

frameworks/C/h2o/h2o.sh

@@ -28,7 +28,7 @@ fi
 # A hacky way to detect whether we are running in the physical hardware or the cloud environment.
 if [[ "$CPU_COUNT" -gt 16 ]]; then
 	echo "Running h2o_app in the physical hardware environment."
-	DB_CONN=3
+	DB_CONN=4
 else
 	echo "Running h2o_app in the cloud environment."
 	DB_CONN=5