Fix geth attach and volume regexes

[yorickdowne]

What I did

I am testing for volume existence with [[ -n "$(__dodocker volume ls -q -f "name=${vol}")" ]] and analogous for non-existance -z. This is not ideal because it's a regex and can give me false positives. docker inspect is better for just existence. For volume ID a bit more is needed

Examples: Directory eth.docker doesn't match any volumes it should but will match eth-docker; directories eth-docker and test-eth-docker will overmatch volume names inside eth-docker

Geth attach hard-codes an old volume name and always failed