fix test_pager_as_cat test case on Solaris

[kulikjak]

On Solaris (and possibly other systems as I don't think this is standardized), the sleep manual page uses a lowercase name in the header, hence SLEEP is not found.

After this change, the test case will look for the section name, which AFAICT is always uppercase.

Alternatively, the assert can be changed to something like this:
assert 'SLEEP' in res.upper(), res

EDIT: The section name approach doesn't work (not sure why it seemed to work yesterday), so I changed it to the res.upper() approach instead. Thinking about that now, it is more robust and platform independent as well.

[rantala]

Also the test should check that man is available:
FAILED tests/test_replwrap.py::REPLWrapTestCase::test_pager_as_cat - AssertionError: bash: man: command not found

[kulikjak]

You are right, but I guess that a separate PR/Issue should be opened for that as that is not a problem on Solaris and fixes a slightly different thing.

[Red-M]

Thanks!