Only use first 8 characters as fault names when comparing/searching.

Note this is currently done silently as the warnings will probably
need to go to the validation code in opm-simulators.

opm/input/eclipse/EclipseState/Grid/FaultCollection.hpp

@@ -62,7 +62,7 @@ private:
     void addFaultFaces(const GridDims& grid,
                        const DeckRecord&  faultRecord,
                        const std::string& faultName);
-    OrderedMap<Fault> m_faults;
+    OrderedMap<Fault, 8> m_faults;
 
 };
 }