Add custom hiera backend for trocla

Only reacts to key namespace trocla::password::<trocla_key>. Looks up
additional parameters via hiera itself as
trocla::options::<trocla_key>::format (string) and
trocla::options::<trocla_key>::options (hash). Looks for <trocla_key> in
trocla as hiera/<source>/<trocla> with <source> iterating over the
configured hiera hierarchy. If not found, creates and returns a new
password with trocla key <trocla_key>.

example entry in hiera.yaml:
backends:
  - ...
  - trocla
trocla:
  - configfile: /etc/puppet/troclarc.yaml
  - format: plain
  - options:
    length: 16

example usage in hiera yaml file:
kerberos::kdc_database_password: "%{hiera('trocla::password::kdc_database_password')}"
trocla::options::kdc_database_password::format: 'plain'
trocla::options::kdc_database_password::options:
  length: '71'

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