This change accomplishes 2 primary things:
1. It generalizes work to enable the EventRateLimit admission plugin.
2. It restructures the anchor so that during an upgrade an "old" anchor
does not try to coordinate the injection of "new" data from
configmaps/secrets.
It also includes these ancillary changes:
* Clean up apiserver argument specification in the chart.
* De-duplicate and realign apiserver arguments in bootstrapping templates.
It has the side effects of:
* Adding a new field, ".apiserver.arguments" to the Genesis config,
which will be the preferred way to configure bootstrapping apiservers
going forward (in lieu of command_prefix).
Change-Id: I33cfe80ee8e29cd79e479a7985e3c098a2288fda