Add Gitlab::VersionInfo class to fix and simplify version check.
Created by: hiroponz
It returns "yes" if required version is "1.7.10" and current version is "1.6.10", because the patch version of current version equals to that of required version.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: hiroponz
It returns "yes" if required version is "1.7.10" and current version is "1.6.10", because the patch version of current version equals to that of required version.