abrt-python: fix deprecation warnings

Signed-off-by: Richard Marko <rmarko@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>
abrt-python: pass DD_OPEN_READONLY only if available

Signed-off-by: Richard Marko <rmarko@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>
abrt-python: fix tests compatibility with python 2.6

Signed-off-by: Richard Marko <rmarko@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>
abrt-python: check if gid equals current users gid

Required for old dump directory style where ownership
is stored in gid instead of uid.

Signed-off-by: Richard Marko <rmarko@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>
abrt-python: fix dbus compatibility on RHEL6

Related to #651.

Signed-off-by: Richard Marko <rmarko@redhat.com>
Signed-off-by: Jakub Filak <jfilak@redhat.com>