[Piglit] New test regarding GL_CLIENT_VERTEX_ARRAY_BIT on push/pop V2

[Mathias Fröhlich]

Hi,

Attached is a new test that checks vertex array state.
Checks are done for the initial state, push and pop of
GL_CLIENT_VERTEX_ARRAY_BIT and buffer objects assigned
to the array state.
The test is not complete in that it does not check every state
that needs to be pushed, but it includes the most important
ones and might be a good starting point to be extended.

Version 2 incorporates the changes requested by Brian Paul.
Mostly better reuse of the alredy existing piglit infrastructure.

Please review and may be apply.

Mathias
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