1. `GitPushService` was still using `{merge,push}_access_level_attributes` instead
of `{merge,push}_access_levels_attributes`.
2. The branches API creates access levels regardless of the state of the
`developers_can_{push,merge}` parameters. This is in line with the UI,
where Master access is the default for a new protected branch.
3. Use `after(:build)` to create access levels in the
`protected_branches` factory, so that `factories_spec` passes. It
only builds records, so we need to create access levels on `build` as
well.
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