handle ssh_keys in ssh_options
cleaning ssh helper
add support for array of keys for default ssh handler
add more ssh_keys support
fix typos
ssh_key empty string is meant as empty array
use only valid Net::SSH options for connections
merge ssh_options
missed one instance of Array - ssh_key_to_a
move build_ssh_options to ssh helper
Merge pull request #762 from jedi4ever/bugfix/ssh_key_support_gh_762

ssh key login not working