Merge branch 'version/bump'

Bump to next dev version (2.2.6dev)
[#5374] Fix CS issues

- trailing whitespace
[#5374] Updated RemoteAddr session validator tests

- Ensured they were testing what they should, based on the changes to
  Zend\Http\PhpEnvironment\RemoteAddress
Merge branch 'hotfix/5374-cleanup' into develop

Forward-ports testing and CS fixes for #5374