Use a better way of skipping all subscription tests on Windows

Andrew Dunstan <andrew@dunslane.net>

Commit: 8d9f06097714ce1f4243329172f73c2d20b896a6
Author: Andrew Dunstan <andrew@dunslane.net>
Date: 2017-05-13T06:49:32Z
Releases: 10.0
Use a better way of skipping all subscription tests on Windows

This way we only need to specify the number of tests in one place, and
the output is also less verbose.

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