The dictionary-based variables didn't work properly and this patch
changes them to individual variables. If users followed the existing
documentation, their environments will be unaffected by this change
(they are still broken).
The new variables follow the pattern `security_VARIABLENAME` which
will soon become the standard for the role to avoid variable name
collisions with other playbooks and roles.
Release notes are included with this patch.
Closes-bug: 1577944
Change-Id: I455f66a0b4f423e2cf0e753b129367427f29479f
f5061fd022