Release GIL in DeviceProxy and AttributeProxy dtor

Zbigniew Reszelarequested to merge
reszelaz/pytango:issue-315 into develop

Avoid deadlock between cppTango map_modification_lock and GIL. More details in #315 (closed) and #302 (closed). Based on patch suggested by Michal Liszcz and Anton Joubert.

Edited by Zbigniew Reszela

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