fix: hold delegate reference to keep it from being deallocated #26
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The problem we were having before was being caused by the system extension delegate being deallocated before the request responses came back.
I didn't initially realize this, but the OSSystemRequest.delegate is a weak reference (you have to click down to the individual field view in the docs to learn this).
So, we keep a strong reference from the VPNService around while we are waiting for the extension to install.