Set ssh key if specified. (#511)
Set ssh key if specified. (#511)

* Set ssh key if specified.

SSH wasn’t working for non-auto-generated keys.

* tox formatting

cimarron-pistoncloud/molecule,retr0h/maquina,j0lly/molecule,metacloud/molecule,cimarron-pistoncloud/molecule,cimarron-pistoncloud/molecule,rgreinho/molecule,rgreinho/molecule,kharkevich/molecule,j0lly/molecule,metacloud/molecule,kireledan/molecule,j0lly/molecule,rgreinho/molecule,metacloud/molecule,retr0h/molecule