Duplicate code reduction part 1: consolidate duplicate signing related classes#6480

zoewangg merged 2 commits intofeature/master/technicaldebt-duplicatecodeaws/aws-sdk-java-v2:feature/master/technicaldebt-duplicatecodefrom

zoewang/AddressDuplicateCodePart1aws/aws-sdk-java-v2:zoewang/AddressDuplicateCodePart1Copy head branch name to clipboard