Set the default ssh port.
Merge branch 'fix_sshd_waiting_port' of https://github.com/calavera/test-kitchen into calavera-fix_sshd_waiting_port

Conflicts:
	lib/kitchen/driver/ssh_base.rb
Propagate default_config from base driver classes into subclasses.

References #102
References #104
Expose provisioner in driver configuration.

Exposes a new config file option: provisioner.

Detects if it is being init'ed in a Module or a Cookbook and defaults to
the right provisioner.

Passed to the driver as the `provisioner` configuration
item.

Includes updates to docs and tests.