Add parameter to revoke old refresh token upon issuing new

[ctriant]

Introduce parameter revoke_refresh_on_issue in order to revoke the Refresh Token used to issue a new one.

[nsklikas]

The logic is reversed here as well. issue_refresh used to override offline_access, which IMHO is the correct behavior. Maybe this is better:

        issue_refresh = kwargs.get("refresh_token", None)
        # The existence of offline_access scope overwrites issue_refresh
        if issue_refresh is None and "offline_access" in scope:
            issue_refresh = True

[peppelinux]

ok @nsklikas I wait for your revision before merge

[peppelinux]

I like this feature, thank you guys!
@ctriant let us know when this PR would be ready to be merged, we're watching many integrations, take your time and give us a know when ready for merge

[ctriant]

I like this feature, thank you guys! @ctriant let us know when this PR would be ready to be merged, we're watching many integrations, take your time and give us a know when ready for merge

@peppelinux i think we are ready, i integrated the suggestions of @nsklikas