Fix: The OPENID_SCOPES maintained by OAuth2AuthHandlerImpl should have offline_access instead of offline #2763
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Motivation:
This is to fix the issue 2742. According to OpenID spec, there is no "offline" scope, it should be called "offline_access" instead.
Conformance:
You should have signed the Eclipse Contributor Agreement as explained in https://github.com/eclipse/vert.x/blob/master/CONTRIBUTING.md
Please also make sure you adhere to the code style guidelines: https://github.com/vert-x3/wiki/wiki/Vert.x-code-style-guidelines