p-b-l: add 2s delay between copying, parallelize

run/runtest.sh needs some time to delete invalid reports, e.g. from
skipped scenarios. This could make p-b-l miss some reports so the
wait and copying is done in parallel Process() and in order to speed up
copying of already existing files (to reduce time from service start to
notifier start), initial copying is done by Pool() of processes.
5 jobs for !848 with dj/publish-behave-logs in 8 minutes and 12 seconds
detached
Status Name Job ID Coverage
  Test
passed TestResults #14983558
manual

00:05:52

passed UnitTests #14983557

00:02:20

 
  External
passed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-test-upstream/1969/

passed https://jenkins-networkmanager.apps.ocp.ci.centos.org/job/NetworkManager-test-mr/779/

06:17:18

passed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-test-upstream/1969/

06:10:57