Remove branch-and-bound log from lp samples

ortools/linear_solver/samples/LinearProgrammingExample.cs

@@ -71,7 +71,6 @@ public class LinearProgrammingExample
         Console.WriteLine("\nAdvanced usage:");
         Console.WriteLine("Problem solved in " + solver.WallTime() + " milliseconds");
         Console.WriteLine("Problem solved in " + solver.Iterations() + " iterations");
-        Console.WriteLine("Problem solved in " + solver.Nodes() + " branch-and-bound nodes");
         // [END advanced]
     }
 }

ortools/linear_solver/samples/SimpleLpProgram.cs

@@ -71,7 +71,6 @@ public class SimpleLpProgram
         Console.WriteLine("\nAdvanced usage:");
         Console.WriteLine("Problem solved in " + solver.WallTime() + " milliseconds");
         Console.WriteLine("Problem solved in " + solver.Iterations() + " iterations");
-        Console.WriteLine("Problem solved in " + solver.Nodes() + " branch-and-bound nodes");
         // [END advanced]
     }
 }

ortools/linear_solver/samples/linear_programming_example.py

@@ -69,7 +69,6 @@ def LinearProgrammingExample():
     print('\nAdvanced usage:')
     print('Problem solved in %f milliseconds' % solver.wall_time())
     print('Problem solved in %d iterations' % solver.iterations())
-    print('Problem solved in %d branch-and-bound nodes' % solver.nodes())
     # [END advanced]