Split find_dr_record_by_name from find_record.
Split find_dr_record_by_name from find_record.

The types and code are just easier to understand this way.

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

clalancette/pycdlib,clalancette/pyiso