Move about 50 test files related to basic layout, packing, alignment,
sections, and image structure into a pack/ subdirectory. Drop the
numeric prefixes from the filenames and update all references in
ftest.py, entry_test.py, and binman_tests.rst
Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
