linear_solver: Remove call to nodes() in lp samples

ortools/linear_solver/samples/LinearProgrammingExample.java

@@ -82,7 +82,6 @@ public class LinearProgrammingExample {
     System.out.println("\nAdvanced usage:");
     System.out.println("Problem solved in " + solver.wallTime() + " milliseconds");
     System.out.println("Problem solved in " + solver.iterations() + " iterations");
-    System.out.println("Problem solved in " + solver.nodes() + " branch-and-bound nodes");
     // [END advanced]
   }
 }

ortools/linear_solver/samples/SimpleLpProgram.java

@@ -85,7 +85,6 @@ public class SimpleLpProgram {
     System.out.println("\nAdvanced usage:");
     System.out.println("Problem solved in " + solver.wallTime() + " milliseconds");
     System.out.println("Problem solved in " + solver.iterations() + " iterations");
-    System.out.println("Problem solved in " + solver.nodes() + " branch-and-bound nodes");
     // [END advanced]
   }
 }

ortools/linear_solver/samples/simple_lp_program.cc

@@ -74,7 +74,6 @@ void SimpleLpProgram() {
   LOG(INFO) << "\nAdvanced usage:";
   LOG(INFO) << "Problem solved in " << solver->wall_time() << " milliseconds";
   LOG(INFO) << "Problem solved in " << solver->iterations() << " iterations";
-  LOG(INFO) << "Problem solved in " << solver->nodes()
             << " branch-and-bound nodes";
   // [END advanced]
 }

ortools/linear_solver/samples/simple_lp_program.py

@@ -65,7 +65,6 @@ def main():
     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]