Change configmaps to secrets to maintain compatibility with [0].
[0] https://review.openstack.org/#/c/617039
Change-Id: Ie95aee1a4104008ca93c23ac9d19245a87fade20
1) 'Values' configures limit settings to be persisted.
2) Previous DivingBell controlled limits those were set
but now are gone are cleared.
3) Previous values of newly set limits are backed up
to /var/divingbell/limits
4) New limit is applied via adding a separate conf file
to /etc/security/limits.d
5) The Doc is updated with appropriate details.
6) Dev env with Vagrant
7) Increase number of expected DaemonSets in 020-test
8) Demo: https://asciinema.org/a/209619
Change-Id: I5efb39c498c2b666b4ba97271b59757f4a0c1ca7
Anderson, Craig (ca846m)