Fix some warnings

in vtkPVServerInformation fix int to bool performance warning
in vtkSMRepresentationProxy fix unreferenced formal paramter warning
in pqMultiBlockInspectorPanel fix signed-unsigned comparison warning
in pqScalarValueListPropertyWidget fix declaration shadow warning
in vtkTexturePainter fix int to bool performance warning

Change-Id: Ic849b1fe0f1518a81e697f6e68bbd925391b4d24
Merge topic 'hardware-selector-pv-bug' into next

daf4920 Fix some warnings