Fixes #22

only lock root, not EC2_USER

Also lock account when changing password

The Amazon marketplace image verifier expects the root account to be
locked, not just cleared. Otherwise images that use the bootstrap can't
be pushed to the AWS marketplace.

Make sure busybox's mountpoint is used

util-linux's busybox does not support -n which prevents root partition expansion.

Tomas Volf authored May 18, 2020 and Mike Crute committed May 19, 2020

Alpine machines does not have to have bash install (and even if they did, I'm
not really sure openrc would use it). So ft should be just sh.

Jake Buchholz Göktürk authored May 01, 2020 and Mike Crute committed May 05, 2020

* get/use Instance MetaData Service v2 token, thanks @junkb (resolves #6)
* make shellcheck happier
* fix installation of multiple SSH keys for EC2_USER
* use 'grep -q' to detect shebang in user_data

Fixes: #5

Disable root/alpine passwords instead scrambling them

* state  as a dependency