Handle sshd_config without Match properly
Handle sshd_config without Match properly

This patch avoids a playbook failure when a system doesn't have
any `Match` lines in its `sshd_config`.

Change-Id: Ibb87e3f52904546379fe7449b5e6f42d6f23a26f

major/openstack-ansible-security,major/openstack-ansible-security