fix(dev-db/etcd): Require c10n, start even if cluster config is missing.

If c10n fails etcd should not start, wait until it is known if there is
a cluster config to use or not. Also now c10n may not write out a
cluster config on ec2 if there isn't a need for one. Make this case
non-fatal and start up etcd as a master node.
bump(coreos-base/coreos-init): Grab fixed c10n script.
fix(dev-db/etcd): Fix filtering of blank lines from c10n peer list
fix(app-admin/fleet): do not enable service by default
bump(coreos-base/coretest): Update to latest code, add live ebuild.

This increases our default timeout for the docker test to 60 seconds.
Update to our current scheme of keeping everything in the live ebuild.
bump(coreos-base/coreos-init): Update to from commit to merge git hash
Merge pull request #351 from marineam/fix-blank-data

Fix blank user-data, fix fleet, fix coretest