Distributions like Debian 8 ship a `gpg` (1.4.x) and a `gpg2` (2.1.x) binary,
which both use the same config files, and thus cannot be used at the same
time, due to incompatible options. Thus we allow the user to specify which
gpg binary they want to use.
Previously this matched very specific HTTP status codes only, while now it
matches any success or redirection status code. It also works for "HTTP/2"
answers in addition to "HTTP/2.0".
Fixes: #331
* Clusters which install to disk auto-update so this bump just
changes the "starting" version. Deployed alpha clusters should
already be using 1109.1.0.
* Examples which install CoreOS to disk should reference
a CoreOS install image from bootcfg assets to speed up
installs and improve the offline use-case
* Update scripts/get-coreos to download and verify the
CoreOS install image
* Update CoreOS version to get rkt 1.2.1->1.6.0 improvements
for running the kubelet wrapper in Kubernetes clusters
* Update CoreOS version for other clusters so users only need
to download one cached version of assets to run examples
* Change assets download location to examples/assets
* FileStore should default to /var/lib/bootcfg/{profiles,groups,
ignition,cloud}
* Assets location should default to /var/lib/bootcfg/assets
* Fix -rpcAddress flag to be -rpc-address
