This is useful during provisioning, when the keys were not generated
by sshd-keygen service or similar principles depending on operating
system.
This is also helpful when running this role in containers, where
is no service running either.
The keys are generally readable only by root, but in RHEL and Fedora,
they are readable also by group ssh_keys, which is used for hostbased
authentication.
This should fix#111
This change will allow the play to continue without error if unsupported hosts are in the lists of targed host.
The play will continue with the supported hosts end the play for the ones which are not supported.
For chroot connection (e.g. when building images instead of working on
live hosts) one cannot restart services etc.
Also due to Ansible bug 21026 one must run systemctl instead of using
the service module, limiting support to EL 7 for the time being.
