Change #550473 removed the quotes around ${BOOTSTRAP_OPTS}
when running the bootstrap-aio.yml playbook. This broke the
ability to specify multiple BOOTSTRAP_OPTS using the space
separated key=value syntax, as demonstrated in the AIO
Quickstart Guide.
This change fixes the brokenness of BOOTSTRAP_OPTS by pre-
fixing each BOOTSTRAP_OPTS item with a "-e", which will
accomodate specifying multiple vars files, as well as
specifying a mix of "key=value" and "@file.yml" items
in BOOTSTRAP_OPTS.
Change-Id: Ia32c646a180f3d3f868dc73eb38778853fbdf000
Depends-On: Ie3960e2e2ac9c0aff0bc36f46182be2fc0a038b3
Bug: 1784491
98d774072b