New service management module.

There is a new service management module placed in the pluginsfolder:

  plugins/modules/ipaservice.py

The service module allows to ensure presence and absence of services, and
manage members and certificates of the service.

Here is the documentation for the module:

  README-service.md

New example playbooks have been added:

    playbooks/service/service-host-is-absent.yml
    playbooks/service/service-host-is-present.yml
    playbooks/service/service-is-absent.yml
    playbooks/service/service-is-disabled.yml
    playbooks/service/service-is-present-with-all-attributes.yml
    playbooks/service/service-is-present-without-host-object.yml
    playbooks/service/service-is-present.yml
    playbooks/service/service-member-allow_create_keytab-absent.yml
    playbooks/service/service-member-allow_create_keytab-present.yml
    playbooks/service/service-member-allow_retrieve_keytab-absent.yml
    playbooks/service/service-member-allow_retrieve_keytab-present.yml
    playbooks/service/service-member-certificate-absent.yml
    playbooks/service/service-member-certificate-present.yml
    playbooks/service/service-member-principal-absent.yml
    playbooks/service/service-member-principal-present.yml

New tests added for the module:

  tests/service/test-service.yml

README.md

@@ -18,6 +18,7 @@ Features
 * Modules for host management
 * Modules for hostgroup management
 * Modules for pwpolicy management
+* Modules for service management
 * Modules for sudocmd management
 * Modules for sudocmdgroup management
 * Modules for sudorule management
@@ -413,6 +414,7 @@ Modules in plugin/modules
 * [ipahost](README-host.md)
 * [ipahostgroup](README-hostgroup.md)
 * [ipapwpolicy](README-pwpolicy.md)
+* [ipaservice](README-service.md)
 * [ipasudocmd](README-sudocmd.md)
 * [ipasudocmdgroup](README-sudocmdgroup.md)
 * [ipasudorule](README-sudorule.md)