backport - stable/icehouse - Increase ssh timeout in ansible.cfg

Backport from https://github.com/rcbops/ansible-lxc-rpc/pull/358
Resolves issue https://github.com/rcbops/ansible-lxc-rpc/issues/358

Cherry-pick from 955846b25021d199f9f781eb1aedc5a35ae75aad