Cleanup some idioms in the raft config tests
Cleanup some idioms in the raft config tests

- remove unnecessary use of grouper
- use regex to match against to messages (a|b and b|a)
- remove assertNoErrorsAreLogged

FAB-16925 #done

Change-Id: I92705ee3027d74fc25ef1f6a8698cb41daf96b86
Signed-off-by: Matthew Sykes <89c6e4c9c1046731a9c37abefc223a83de36a5d9@us.ibm.com>

jimthematrix/fabric,binhn/fabric,manish-sethi/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,hyperledger/fabric,manish-sethi/fabric,binhn/fabric,binhn/fabric,muralisrini/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,hyperledger/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,manish-sethi/fabric-sidedb