Problem: When building a hybrid cluster with windows nodes there is only
a single set of overrides you can use per service. This limits
configuring the node as service args and prefix_path sometimes need to
be specific for the different OS.
Solution: Add support for `win_` prefixed parameters for cluster level
`path_prefix` and service level `extra_args`, `extra_env` and
`extra_binds`. Params will work as before, passing in the non `win_`
prefixed params, IF you set the `win_` prefixed params it willy only use
those meaning you will need to duplicate the params in both config
sections of your rke cluster yaml.
Problem: Because of the unix socket reference, Windows breaks on rke up
Root cause: Vendor of docker/docker
Resolution: I was checking what was changed in vendor but it seems this setting is not used, as we configure Docker socket per host.
This addresses users issues in being unable to use RKE command line
using SSH_AUTH_SOCK. On OSX the socket env var is set, but nothing
is listening. Also, Linux users have reported issues. To address this
the default mode is to not use SSH Agent Auth. A user must set it
explicitly in either the config file or on the CLI. The only way
to use a passphrase protected key file is with a properly configured
SSH Agent and using SSH Agent Auth.
This defaults to using the SSH Agent or a passwordless key file.
It also refactors the Dialer methods a bit to simplify and decouple
the host object from the dialer.
