Verify ZFS Test Suite scripts executability

This change adds a make target 'testscheck' which verifies all ksh test
scripts, part of the ZFS Test Suite, have their executable bit set:
this should avoid adding new test scripts that cannot be executed by
the test-runner.py which would result in the following warning message:

   Warning: Test removed from TestGroup because it failed verification.

This also verifies both *.cfg and *.kshlib files used in the ZFS Test
Suite are not executable.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Signed-off-by: loli10K <[email protected]>
Closes #7131 

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