Add an upgrader which modifies `accounts-*` packages automatically.
Add an upgrader which modifies `accounts-*` packages automatically.

 The transformations to be made here are:
   * Existence of `accounts-<service>` **adds** `<service>-config-ui`
   * Existence of `<service>` **changes to** `<service>-oauth`
 https://github.com/meteor/meteor/issues/7715#issuecomment-276529351

 Relates to:

  * facebook: https://github.com/meteor/meteor/pull/7728
  * github: https://github.com/meteor/meteor/pull/8303
  * google: https://github.com/meteor/meteor/pull/8275
  * meetup: https://github.com/meteor/meteor/pull/8231
  * meteor-developer: https://github.com/meteor/meteor/pull/8305
  * twitter: https://github.com/meteor/meteor/pull/8283
  * weibo: https://github.com/meteor/meteor/pull/8302

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