Various nits and alignments for testnet runtimes (#3024)

There were several improvements and PRs that didn't apply to all
runtimes, so this PR attempts to align those small differences. In
addition, the PR eliminates unused dependencies across multiple modules.

Relates to PR for `polkadot-fellows`:
https://github.com/polkadot-fellows/runtimes/pull/154

cumulus/parachains/common/src/lib.rs

@@ -19,7 +19,6 @@ pub mod impls;
 pub mod message_queue;
 pub mod rococo;
 pub mod westend;
-pub mod wococo;
 pub mod xcm_config;
 pub use constants::*;
 pub use opaque::*;

cumulus/parachains/common/src/wococo.rs

@@ -1,17 +0,0 @@
-// Copyright (C) Parity Technologies (UK) Ltd.
-// SPDX-License-Identifier: Apache-2.0
-
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// 	http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// re-export rococo
-pub use crate::rococo::{consensus, currency, fee};