Allow operators to use their custom policy files.
Avoid maintain policy files in kolla repos, only copying
the files when an operator add their custom config.
Implements: blueprint custom-policies
Change-Id: Icf3c961b87cbc7a1f1dd2ffbfffcf271d151d862
do_reconfigure.yml is introduced to use serial directive. But we use
it in wrong. Now serial has moved to playbook file. So it is time to
remove the do_reconfigure.yml file
Closes-Bug: #1628152
Change-Id: I8d42d27e6bc302a0e575b0353956eaef9b2ca9fd
