Integrate with hiera

[cardil]

Options are:

• counter - A sequential password number. Changing the password should be done by
  advancing this number. Default value is 1.
• scope - A definition of scope that the password will be generated from. Defaults to alnum.
• length - A length of password to be generated in number of signs. Default value is 16.

All options described above can also be set via Hiera. To do this define a key that is
created by adding a password name and suffix of ::counter, ::scope, or ::length. Ex.:

root@puppet.example.org::counter: 13
root@puppet.example.org::scope: alnum
root@puppet.example.org::length: 32

You can specify a counter both in Puppet code and in Hiera. Specifying scope or length,
in both places isn't supported and will result in compilation error.