RPM Support

It looks like we fixed this in the importers/yum/utils.py codepath for https://pulp.plan.io/issues/2093, but the migrations/0037_rpm_primary_repodata_new_location.py codepath still doesn't account for this issue. This can, in some instances, cause an exception during migrations

Halting migrations due to a migration failure.
'ascii' codec can't decode byte 0x9c in position 1: ordinal not in range(128)
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pulp/server/db/manage.py", line 227, in main
    return _auto_manage_db(options)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/manage.py", line 294, in _auto_manage_db
    migrate_database(options)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/manage.py", line 129, in migrate_database
    update_current_version=not options.test)
  File "/usr/lib/python2.7/site-packages/pulp/server/db/migrate/models.py", line 186, in apply_migration
    migration.migrate()
  File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/migrations/0037_rpm_primary_repodata_new_location.py", line 44, in migrate
    migrate_rpm_base(rpm_collection, rpm)
  File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/migrations/0037_rpm_primary_repodata_new_location.py", line 59, in migrate_rpm_base
    delta['repodata'] = fix_location(unit['repodata'], unit['filename'])
  File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/migrations/0037_rpm_primary_repodata_new_location.py", line 73, in fix_location
    faked_primary = fake_xml_element(repodata['primary'])
  File "/usr/lib/python2.7/site-packages/pulp_rpm/plugins/migrations/0037_rpm_primary_repodata_new_location.py", line 111, in fake_xml_element
    repodata_snippet.encode(codec)
UnicodeDecodeError: 'ascii' codec can't decode byte 0x9c in position 1: ordinal not in range(128)