Parameterized keymaster_storage and home

[shermdog]

I updated the keymaster_storage and home variables to allow them to be overridden when declaring the class:

  class{'sshkeys':
    keymaster_storage => '/common/puppet/keys',
    home => '/common/home',
  }

  # Put private key for internal access to home directory
  sshkeys::set_client_key_pair{'rsherman-internal':
    keyname => 'rsherman_internal',
    user => 'rsherman',
  }

  # Enable internal access key
  sshkeys::set_authorized_keys{'rsherman-internal':
    keyname => 'rsherman_internal',
    user => 'rsherman',
  }