try harder when initializing

the storage initialization is async task, so sometimes
we try to access some files before the file exists, in
that case we should just wait a while and try again

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1119699
Change-Id: Iac39bedfa78479f71674c3f5e673ba3814f52279
Signed-off-by: Jiri Moskovcak <jmoskovc@redhat.com>