Description of problem:
When running rhn-satellite-export against a large channel with the
--make-iso=dvd option, it fails with "Error: OverflowError caught!"

Version-Release number of selected component (if applicable):
rhns-satellite-tools-5.1.0-57


How reproducible:
Always

Steps to Reproduce:
1. Sync the rhel-x86_64-server-5 channel
2. Run /usr/bin/rhn-satellite-exporter -crhel-x86_64-server-5
--dir=/var/satellite/dump --make-isos=dvd
3. Wait
  
Actual results:
isos are created but program dies with error

Expected results:
Exits cleanly

Additional info:
This is a bug in the /usr/share/rhn/satellite_tools/intersat_sync/iss.py file.
Line 1096 reads:

if self.options.make_isos != "dvds":

And should read

if self.options.make_isos != "dvd":

Because the option being passed in is 'dvd' not 'dvds'

Personally, I think this is more of a band-aid for the bigger picture of why the
md5sum is failing for the dvd isos.  Maybe this should be rewritten to not fail.