testsuite: add test for reporter-ureport attachments

Related to abrt/libreport#200

Signed-off-by: Jakub Filak <jfilak@redhat.com>
adapt post_create event to the recent changes in reporter-ureport

Related to abrt/libreport#200

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Merge pull request #747 from abrt/gh_libreport_200

uReport attachments