Release GIL for more DeviceProxy and DeviceImpl calls

Closes #620 (closed)

The following method calls were changed to release GIL:

DeviceProxy

- DeviceProxy.info
- DeviceProxy.description
- DeviceProxy.black_box
- DeviceProxy.command_list_query
- DeviceProxy.attribute_list_query_ex
- DeviceProxy.set_attribute_config
- DeviceProxy.polling_status
- DeviceProxy.poll_command
- DeviceProxy.poll_attribute
- DeviceProxy.is_command_polled
- DeviceProxy.is_attribute_polled
- DeviceProxy.stop_poll_command
- DeviceProxy.stop_poll_attribute
- DeviceProxy.add_logging_target
- DeviceProxy.remove_logging_target
- DeviceProxy.get_logging_target
- DeviceProxy.get_logging_level
- DeviceProxy.set_logging_level
- DeviceProxy.lock
- DeviceProxy.unlock
- DeviceProxy.adm_name
- DeviceProxy.name
- DeviceProxy.alias
- DeviceProxy.get_tango_lib_version
- DeviceProxy.get_command_list
- DeviceProxy.get_command_config
- DeviceProxy.command_query
- DeviceProxy.import_info
- DeviceProxy.get_property
- DeviceProxy.put_property
- DeviceProxy.delete_property
- DeviceProxy.get_property_list
- DeviceProxy.get_attribute_list
- DeviceProxy.get_attribute_config
- DeviceProxy.get_attribute_config_ex
- DeviceProxy.attribute_query
- DeviceProxy.attribute_list_query
- DeviceProxy.get_command_poll_period
- DeviceProxy.get_attribute_poll_period
- DeviceProxy.locking_status
- DeviceProxy.is_locked
- DeviceProxy.is_locked_by_me
- DeviceProxy.get_locker

DeviceImpl

- DeviceImpl.set_attribute_config
- DeviceImpl.is_attribute_polled
- DeviceImpl.is_command_polled
- DeviceImpl.poll_attribute
- DeviceImpl.poll_command
- DeviceImpl.stop_poll_attribute
- DeviceImpl.stop_poll_command