Provide module to fetch system options from oVirt Engine RESTAPI

[mwperina]

We have oVirt Engine RESTAPI endpoint to fetch system options:

http://ovirt.github.io/ovirt-engine-api-model/4.4/#services/system_options

We need to implement module ovirt_system_options_info to be able to fetch those system options. We should be able to support following flows:

1. Provide option name and version to fetch specific value:

ovirt_system_options:
    name: "IsPortIsolationSupported"
    version: "4.4"

That should return only value for specific version, for example:

  'IsPortIsolationSupported': {
    '4.4': 'false'
  }

2. Provide only option name to fetch values per version

ovirt_system_options:
    name: "IsPortIsolationSupported"

That should return a dictionary with option values for all version, for example:

  'IsPortIsolationSupported': {
    '4.2': 'false',
    '4.3': 'false',
    '4.4': 'false',
    '4.5': 'true',
  }

3. Provide empty name to fetch all options

ovirt_system_options:

That should return a dictionary with all options and their values, for example

  'IsPortIsolationSupported': {
    '4.2': 'false',
    '4.3': 'false',
    '4.4': 'false',
    '4.5': 'true',
  },
  'DisableFenceAtStartupInSec': {
    'general': '300'
  },
...