reporter-rhtsupport: generate archive name from problem dir name

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>
reporter-upload: create tarball with the name based on directory's name

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