ureport: allow minus char in reporter field

Related to #209

Signed-off-by: Richard Marko <rmarko@redhat.com>
ureport compat: always create user dict

Related to #209

Signed-off-by: Richard Marko <rmarko@redhat.com>
tests: cover ureport & attachment processing

Closes #209

Signed-off-by: Richard Marko <rmarko@redhat.com>
Merge pull request #211 from abrt/gh209

Add tests for ureport & attachment processing, fix minor issues found