Before we were just returning an empty response or something non-meaningful

While here document what is needed to actually run go generate.

Includes a test to know that we're handling the JSON properly.

This also adds a test for checking all hosts in a HostGroup.

We were missing some attributes, like not adding any groups or display names. This also adds a test which checks whether we are marshalling hosts into JSON correctly.

And also add a icinga_test package that does the black-box tests i.e. tests which speak to a real icinga server.

getopt(1) clears the value of "$@", so grab it before it's cleared

This adds a newTestClient option so that we aren't constantly creating new http transports clients and all that

Tests of hostgroup operations are done in TestFilter

It was required to satisfty the object interface but the interface changed because it wasn't used anywhere.

Explanation for use is in the README

Getting all Hosts is the same as calling FilterHosts with an empty filter anyway.

Doing a GET without a query is the same as doing a GET with an empty query, so there's no point having 2 separate methods.

Getting all objects is the same as getting objects with a zero filter.

Encoding a Host, Service and User as JSON is the same so there's no point having different statements.