Return a dict with information about this node

    CLI Example:

    .. code-block:: bash

        salt '*' virt.node_info

def node_info():
    '''
    Return a dict with information about this node

    CLI Example:

    .. code-block:: bash

        salt '*' virt.node_info
    '''
    with _get_xapi_session() as xapi:
        # get node uuid
        host_rec = _get_record(xapi, 'host', _get_all(xapi, 'host')[0])
        # get first CPU (likely to be a core) uuid
        host_cpu_rec = _get_record(xapi, 'host_cpu', host_rec['host_CPUs'][0])
        # get related metrics
        host_metrics_rec = _get_metrics_record(xapi, 'host', host_rec)

        # adapted / cleaned up from Xen's xm
        def getCpuMhz():
            cpu_speeds = [int(host_cpu_rec["speed"])
                          for host_cpu_it in host_cpu_rec
                          if "speed" in host_cpu_it]
            if cpu_speeds:
                return sum(cpu_speeds) / len(cpu_speeds)
            else:
                return 0

        def getCpuFeatures():
            if host_cpu_rec:
                return host_cpu_rec['features']

        def getFreeCpuCount():
            cnt = 0
            for host_cpu_it in host_cpu_rec:
                if not host_cpu_rec['cpu_pool']:
                    cnt += 1
            return cnt

        info = {
                'cpucores': _get_val(host_rec,
                                    ["cpu_configuration", "nr_cpus"]),
                'cpufeatures': getCpuFeatures(),
                'cpumhz': getCpuMhz(),
                'cpuarch': _get_val(host_rec,
                                    ["software_version", "machine"]),
                'cputhreads': _get_val(host_rec,
                                    ["cpu_configuration", "threads_per_core"]),
                'phymemory': int(host_metrics_rec["memory_total"]) / 1024 / 1024,
                'cores_per_sockets': _get_val(host_rec,
                                    ["cpu_configuration", "cores_per_socket"]),
                'free_cpus': getFreeCpuCount(),
                'free_memory': int(host_metrics_rec["memory_free"]) / 1024 / 1024,
                'xen_major': _get_val(host_rec,
                                    ["software_version", "xen_major"]),
                'xen_minor': _get_val(host_rec,
                                    ["software_version", "xen_minor"]),
                'xen_extra': _get_val(host_rec,
                                    ["software_version", "xen_extra"]),
                'xen_caps': " ".join(_get_val(host_rec, ["capabilities"])),
                'xen_scheduler': _get_val(host_rec,
                                    ["sched_policy"]),
                'xen_pagesize': _get_val(host_rec,
                                    ["other_config", "xen_pagesize"]),
                'platform_params': _get_val(host_rec,
                                    ["other_config", "platform_params"]),
                'xen_commandline': _get_val(host_rec,
                                    ["other_config", "xen_commandline"]),
                'xen_changeset': _get_val(host_rec,
                                    ["software_version", "xen_changeset"]),
                'cc_compiler': _get_val(host_rec,
                                    ["software_version", "cc_compiler"]),
                'cc_compile_by': _get_val(host_rec,
                                    ["software_version", "cc_compile_by"]),
                'cc_compile_domain': _get_val(host_rec,
                                    ["software_version", "cc_compile_domain"]),
                'cc_compile_date': _get_val(host_rec,
                                    ["software_version", "cc_compile_date"]),
                'xend_config_format': _get_val(host_rec,
                                    ["software_version", "xend_config_format"])
                }

        return info