a-a-ureport: allow to send ureport more than once

- script should keep the number of sent ureports less than or
  equal to the number of problem occurrences
- if the numbers are equal the script should reproduce
  reponse of reporter-ureport

- closes #615

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>