Fixes kytoon ssh broken by thor 0.17.0

Thor interpreted ssh(opt = (opt or {})) as a task that doesn't
accept any parameter. This is fixed by making ssh(*) which
hints to thor that the task accepts multiple arguments
Merge pull request #12 from sthaha/develop

Fixes kytoon ssh broken by thor 0.17.0
Updates.
Bump version.
libvirt: Retry initial ssh command.

Add remote_exec retry for libvirt_provider (fixes issue where
initial ssh command fails).
Bump version.