* migrate gplus to google oauth2 provider. this still provides support for old gplus connections.

* Update models/oauth2.go

Co-Authored-By: Antoine GIRARD <sapk@users.noreply.github.com>

* make vendor

* Retry create issue to cope with duplicate keys

* Use  .SetExpr().Where().Insert()

* fix error log when loading issues caused by a xorm bug

* upgrade packages

* fix fmt

* fix Consistency

* fix tests