PR flags: adds support for running/pending state
This patch adds support for runinng state for Fedora CI.
It keeps only the recent flag around, so running transitions nicely
to complete/error state and vice versa (for reruns).
Resolves https://pagure.io/fedora-ci/general/issue/3
Signed-off-by: Miroslav Vadkerti <mvadkert@redhat.com>