This commit migrates all of the `shield.` settings to `xpack.security.` and makes changes to
use the new Settings infrastructure in core.
As a cleanup, this commit also renames Shield to Security since this class is only in master
and will not affect 2.x.
See elastic/elasticsearch#1441
Original commit: elastic/x-pack-elasticsearch@a5a9798b1b
(there are other indices too, montoring indices and waiting for green fails there because these indices have replica shards)
Original commit: elastic/x-pack-elasticsearch@63dd3e6ebb
Too many places are checking for enumerations when they're really more interested in a "higher" level of
information. This will help with the forthcoming addition of the STANDARD operation mode as well.
Original commit: elastic/x-pack-elasticsearch@2799c27e19
These privileges no longer need to be defined as a custom privilege since the
code is now consolidated into a single plugin. This also changes the manage
cluster privilege to be an alias to the all privilege.
Original commit: elastic/x-pack-elasticsearch@a7f444c898
