qingstor: Fixes before merge

* use rclone's http.Client for bwlimit, logging, etc
  * remove extraneous fmt.Sprintf from logging
  * fix icon in docs
  * add docs about --fast-list
  * hoist md5 regexp compilation out of function
  * create container if necessary on server side copy
  * keep note of whether the container has been deleted
  * build constraint not to compile for plan9

fstest/fstests/gen_tests.go

@@ -162,6 +162,6 @@ func main() {
 	generateTestProgram(t, fns, "Sftp")
 	generateTestProgram(t, fns, "FTP")
 	generateTestProgram(t, fns, "Box")
-	generateTestProgram(t, fns, "QingStor")
+	generateTestProgram(t, fns, "QingStor", buildConstraint("!plan9"))
 	log.Printf("Done")
 }