These are all the code changes from Brian's review:
* change #! line
* rename "host" to "name" [keep as alias]
* make documentation clearer
* imports 1 per line
* use get_bin_path to find ssh-keygen
* key not actually required when removing host
The known_hosts module lets you add or remove a host from the
known_hosts file. This is useful if you're going to want to use the
git module over ssh, for example. If you have a very large number of
host keys to manage, you will find the template module more useful.
This was pull request 7840 from the old ansible repo, which was
accepted-in-principle but not yet merged. The mailing list thread
reading it is:
https://groups.google.com/forum/#!topic/ansible-devel/_e7H_VT6UJE/discussion
