Refactor and add tests for System.IO.Pipes library

1) Refactor to base class, common test cases so they can be shared between the
    Anonymous/Named Client/Server combinations.

2) Modify the Anonymous/Named throws test classes to use new base class

3) Complete the various permutations of throws tests e.g. before write parameter checking was only done on Anonymous classes, now both Anonymous/Named and Client/Server

4) Add parameter name checking on various throws tests

5) Add tests for incompatible modes between client/server named pipes

6) Replace NotReachable() calls with Action {} on tests

7) Permute out the various directions (in, out) on throws tests

Author: bpschoch