Add helper to look for missing binaries
Fedora has merged /usr/bin and /bin while Debian uses distinct
directories for /usr/bin and /bin. Debian also uses different directory
for libexec files.
A new paths.check_paths() helper makes it easier to detect missing or
wrong paths.
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>