Reorganize init source into directories
fix(coreos_startup) Move state/oem mounts into units.

Use systemd to properly handle device dependencies for partition
resizing and mounting, removing those steps from coreos_startup.
fix(resize-stateful): Add comment on systemd's path escaping scheme.
fix(resize-stateful): switch from mawk to awk symlink
fix(coreos-startup): Use new script path under /usr/lib/coreos
Merge pull request #2 from marineam/resize-state

Resize state updates