Rename LinearSolverTerminationType enums.

This increases clarity, drops redundant enums and makes things
cleaner all around.

Change-Id: I761f195ddf17ea6bd8e4e55bf5a72863660c4c3b
diff --git a/internal/ceres/symmetric_linear_solver_test.cc b/internal/ceres/symmetric_linear_solver_test.cc
index f33adb4..ac5a774 100644
--- a/internal/ceres/symmetric_linear_solver_test.cc
+++ b/internal/ceres/symmetric_linear_solver_test.cc
@@ -71,7 +71,7 @@
   LinearSolver::Summary summary =
       solver.Solve(A.get(), b.data(), per_solve_options, x.data());
 
-  EXPECT_EQ(summary.termination_type, TOLERANCE);
+  EXPECT_EQ(summary.termination_type, LINEAR_SOLVER_SUCCESS);
   ASSERT_EQ(summary.num_iterations, 1);
 
   ASSERT_DOUBLE_EQ(1, x(0));
@@ -128,7 +128,7 @@
   LinearSolver::Summary summary =
       solver.Solve(A.get(), b.data(), per_solve_options, x.data());
 
-  EXPECT_EQ(summary.termination_type, TOLERANCE);
+  EXPECT_EQ(summary.termination_type, LINEAR_SOLVER_SUCCESS);
 
   ASSERT_DOUBLE_EQ(0, x(0));
   ASSERT_DOUBLE_EQ(1, x(1));