Use the rm_hard_link code for rm_file as well.
Use the rm_hard_link code for rm_file as well.

This way we consolidate all of that code into one place.

Signed-off-by: Chris Lalancette <281cd07d7578d97c83271fbbf2faddb83ab3791c@gmail.com>

clalancette/pycdlib,clalancette/pyiso