Pythonify Plugin._path_in_pathlist()

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Fix x86 arch detection in processor plugin

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Refactor Plugin.collect() pathway

Clean up and refactor the collect() path in preparation for
fixing the recursive tree copying code.

- Move string and command collection into their own methods
- Move glob expansion from add_copy_spec*() to
  collect_copy_specs()
- Rename do_copy_file_or_dir() to do_copy_path()

There are no functional changes as a result of this patch.

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>
Remove obsolete checksum reference from utilities_tests.py

Signed-off-by: Bryn M. Reeves <bmr@redhat.com>