[perl #128856] DirHandle: Improve test coverage and providedescriptions

# New Ticket Created by  James E Keenan 
# Please include the string:  [perl #128856]
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The coverage of DirHandle provided by tests in lib/DirHandle.t is poor and none of the individual tests have descriptions.

The patch attached provides full statement, branch, condition and subroutine coverage and provides descriptions for all tests.

Please review, particularly with respect to VMS and other edge cases.

Thank you very much.
-- 
James E Keenan (jkeenan@cpan.org)

• [perl #128856] DirHandle: Improve test coverage and providedescriptions by James E Keenan