curl --max-time in seconds, not minutes
Timeout is supposed to be 15 minutes. Large files need enough time
to be downloaded. Curl accepts seconds, not minutes.
Fixes: #13
Relates: https://pagure.io/fedora-infrastructure/issue/9821
JIRA: RHELCMP-6049
Signed-off-by: Ondřej Nosek <onosek@redhat.com>