Mock framework should be available in around hooks

**Problem**: sometimes, the mocking framework is not available in the `around` hooks. On further inspection, we can see this only happens if the spec containing such an `around` hook is run first, before any other specs.

**Reason**: `setup_mocks_for_rspec` is called only after the `around` hook has started, and before the `before` hooks have run. Therefore, if the first spec to run has an `around` hook, this won't have access to the mocking framework. If this spec is run later instead, the mocking framework will have been activated by the time the `around` hook is reached.

**The test case**: I am providing one, but I'm not sure that's the place where you would want it. If you have any feedback, I'll be happy to relocate it.

**Versions affected**: this pull request is against master, but I initially experienced this problem with 2.14.7, where the patch is almost the same. If this is pull request is ok, I'll be happy to create another one for 2-14-maintenance, or whatever else necessary.