testsuite: Add module playground dir
Remove references to systemd from the bash completion file

And restore the original LGPL disclaimer text.
Add gitignore to module playground
Bail out of index_mm_open() if fstat() fails
Ensure read_long() reads the correct number of bytes from the index
Do not return pointer to stack-allocated variable in prio_to_str()
Free realnames if kmod_lookup_alias_from_alias_bin() fails
Free abspath if kmod_module_new_from_path() fails.
Close /sys/module/$NAME directory if opening /proc/module fails.