Revise "create_test_inputs" to simplify the file structure as
these testcases don't need to be nested as much as bin/ls/ls_tests.sh
do when verifying ls -a, ls -A, etc. This allows the tests to make
all paths relative to the top of the temporary directory instead of
always tacking on $ATF_TMPDIR, thus complicating things unnecessarily

Create non-empty files in create_test_inputs as well now, similar to
create_test_inputs2 in bin/ls/ls_tests.sh

Compare the input files to the output file contents using diff where
possible:

• Skip over the fifo comparison for now because it always fails
• Skip over the symlink comparison on cd9660 because it always fails today

Sponsored by: EMC / Isilon Storage Division
MFC after: 2 weeks
X-MFC with: r289739