commit 4b86923358c0 (Fixes for tiny-cloud Wrapper) changed API so all
init functions had an init__ prefix and the SKIP_INIT_ACTION was moved
to tiny-cloud.
Adjust the tests for this.
Simplify it a bit.
- use awk /proc/mounts instead of busybox mountpoint
- use sysfs to find partition and volume. This is more robust
- add tests for it