Implements __str__ method for PyMI objects

[claudiubelu]

Currently, PyMI debugging using PyMI can be a bit difficult, when compared to the old WMI.

For example, the old WMI has an object string representation implementation, meaning that WMI objects can easily and usefully be printed, while PyMI doesn't:

>>> print new_wmi.Msvm_VirtualSystemSettingData()[0]
<wmi._Instance object at 0x0000000002E45CC0>

This patch adds a similar str implementation to PyMI.

[claudiubelu]

FWIW, this is how it looks now:

>>> vms = conn.Msvm_ComputerSystem()
>>> vms[0]
<pymi_object: \\WIN-SRVR2\root\virtualization\v2:Msvm_ComputerSystem.Name="WIN-SRVR2",CreationClassName="Msvm_ComputerSystem">
>>> print(vms[0])
instance of Msvm_ComputerSystem
{
        Caption = "Hosting Computer System";
        Description = "Microsoft Hosting Computer System";
        ElementName = "WIN-SRVR2";
        InstanceID = "None";
        CommunicationStatus = None;
        DetailedStatus = None;
        HealthState = 5;
        InstallDate = None;
        Name = "WIN-SRVR2";
        OperatingStatus = None;
        OperationalStatus = (2,);
        PrimaryStatus = None;
        Status = "OK";
        StatusDescriptions = ('OK',);
        AvailableRequestedStates = None;
        EnabledDefault = 2;
        EnabledState = 2;
        OtherEnabledState = "None";
        RequestedState = 12;
        TimeOfLastStateChange = None;
        TransitioningToState = None;
        CreationClassName = "Msvm_ComputerSystem";
        IdentifyingDescriptions = None;
        NameFormat = "None";
        OtherIdentifyingInfo = None;
        PrimaryOwnerContact = "None";
        PrimaryOwnerName = "None";
        Roles = None;
        Dedicated = None;
        OtherDedicatedDescriptions = None;
        PowerManagementCapabilities = None;
        ResetCapability = 1;
        EnhancedSessionModeState = None;
        FailedOverReplicationType = None;
        LastApplicationConsistentReplicationTime = None;
        LastReplicationTime = None;
        LastReplicationType = None;
        LastSuccessfulBackupTime = None;
        NumberOfNumaNodes = 1;
        OnTimeInMilliseconds = None;
        ProcessID = None;
        ReplicationHealth = None;
        ReplicationMode = None;
        ReplicationState = None;
        TimeOfLastConfigurationChange = None;
};
>>> vms[0].RequestStateChange
<function RequestStateChange (RequestedState, TimeoutPeriod)>

[mickare]

Works like a charm, why is this not accepted?