Add lots more fun output to nbench (#1672)

* update nbench output to be more consistent for single vs. directory benchmark.

* wip

* add types used in model

* fix test

* style

* catch all exceptions when running any option

src/ngraph/type/element_type.cpp

@@ -174,6 +174,6 @@ namespace ngraph
 std::ostream& element::operator<<(std::ostream& out, const element::Type& obj)
 {
     out << "element::Type{" << obj.m_bitwidth << ", " << obj.m_is_real << ", " << obj.m_is_signed
-        << "," << obj.m_cname << "}";
+        << ", \"" << obj.m_cname << "\"}";
     return out;
 }

test/type_prop.cpp

@@ -497,9 +497,10 @@ void test_binary(std::string node_type,
         }
         catch (const NodeValidationError& error)
         {
-            EXPECT_HAS_SUBSTRING(error.what(),
-                                 std::string("Argument 0 element type element::Type{32, 1, "
-                                             "1,float} differs in element type from argument 1"));
+            EXPECT_HAS_SUBSTRING(
+                error.what(),
+                std::string("Argument 0 element type element::Type{32, 1, "
+                            "1, \"float\"} differs in element type from argument 1"));
         }
         catch (...)
         {
@@ -592,9 +593,10 @@ void test_binary_logical(std::string node_type,
         }
         catch (const NodeValidationError& error)
         {
-            EXPECT_HAS_SUBSTRING(error.what(),
-                                 std::string("Argument 0 element type element::Type{8, 0, 1,char} "
-                                             "differs in element type from argument 1"));
+            EXPECT_HAS_SUBSTRING(
+                error.what(),
+                std::string("Argument 0 element type element::Type{8, 0, 1, \"char\"} "
+                            "differs in element type from argument 1"));
         }
         catch (...)
         {