Migrate more spec files to the new RSpec3 matchers
Update README for Agentil probe 4.00

Before version 4, the sapbasis_agentil probe used the nimsoft
configuration file format for its configuration. This has changed and
the configuration format is now JSON based. Since we already the agentil
util class and all other classes to use this new configuration format,
it is no longer possible to use the puppet types to handle configuration
files prior to version 4.00.

Update the README to document that dependency
Remove the `monitors` property

Since version 4.00 an agentil template does no longer have a `monitors`
property. This has propably been removed because it can be derived from
the configured `jobs` and hence can be generated on the fly.

Since it's no longer an attribute we can read or set, remove it as a
property from the `agentil_template` type