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Avoid deprecation warning in TaurusDevicePanel

Carlos Pascual requested to merge github/fork/cpascual/remove_deprecation_warning into develop

TaurusDevicePanel triggers a deprecation warning when showing the state.

To reproduce:

$ taurusdevicepanel sys/tg_test/1
(...)
MainThread     WARNING  2018-08-20 18:15:39,950 TaurusRootLogger: /nfs/home/cpascual/src/taurus/lib/taurus/qt/qtgui/base/tauruscontroller.py:83: DeprecationWarning: _get_value is deprecated since 4.0. Use .rvalue instead
  return getattr(valueObj, "value", None)

MainThread     INFO     2018-08-20 18:15:42,083 TaurusRootLogger: 
*********************
< Deprecation Counts (6):
        6 * "_get_value is deprecated since 4.0. Use .rvalue instead" >

This PR fixes it by using the new API (.rvalue) instead of the old one (.value)

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