[patch] Add required header fields to invalid test cases

[John (J5) Palmieri]

This patch updates the invalid test cases to include the missing PATH
header field which is required.  I also updated the spec documentation
to indicate that INTERFACE, MEMBER, and PATH are all required fields.

-- 
John (J5) Palmieri
Associate Software Engineer
Desktop Group
Red Hat, Inc.
Blog: http://martianrock.com
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