Merge pull request #4828 from marquiz/devel/runc-update-rdt-single-schema

runc update: don't lose intelRdt state

update.go

@@ -387,8 +387,12 @@ other options are ignored.
 					return err
 				}
 			}
-			config.IntelRdt.L3CacheSchema = l3CacheSchema
-			config.IntelRdt.MemBwSchema = memBwSchema
+			if l3CacheSchema != "" {
+				config.IntelRdt.L3CacheSchema = l3CacheSchema
+			}
+			if memBwSchema != "" {
+				config.IntelRdt.MemBwSchema = memBwSchema
+			}
 		}
 
 		// XXX(kolyshkin@): currently "runc update" is unable to change