(maint) Fix face_collection_spec to properly restore global state. #2422
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The spec attempts to restore global state stored in
Puppet::Interface::FaceCollection so that it doesn't interfere with
other specs that may use faces.
It fails to clear any files required by the autoloader, but clears the
@Faces member. The result is that if a face is referenced again from
another spec, it doesn't get defined and added to @Faces and cannot be
found.
The fix is to clear the state before and after each example.
The problem can be observed with the following:
rspec spec/unit/interface/face_collection_spec.rb spec/unit/application/face_base_spec.rb