Fix query plan tests on neo4j 3.5

Operator type names have changed. This commit makes the assertions
more generic.

Author: lutovich

test/v1/session.test.js

@@ -291,10 +291,10 @@ describe('session', () => {
         const sum = result.summary;
         expect(sum.hasPlan()).toBe(true);
         expect(sum.hasProfile()).toBe(false);
-        expect(sum.plan.operatorType).toBe('ProduceResults');
+        expect(sum.plan.operatorType).toBeDefined();
         expect(isString(sum.plan.arguments.runtime)).toBeTruthy();
         expect(sum.plan.identifiers[0]).toBe('n');
-        expect(sum.plan.children[0].operatorType).toBe('CreateNode');
+        expect(sum.plan.children[0].operatorType).toBeDefined();
         done();
       });
   });
@@ -310,7 +310,7 @@ describe('session', () => {
         const sum = result.summary;
         expect(sum.hasPlan()).toBe(true); //When there's a profile, there's a plan
         expect(sum.hasProfile()).toBe(true);
-        expect(sum.profile.operatorType).toBe('ProduceResults');
+        expect(sum.profile.operatorType).toBeDefined();
         expect(isString(sum.profile.arguments.runtime)).toBeTruthy();
         expect(sum.profile.identifiers[0]).toBe('n');
         expect(sum.profile.children[0].operatorType).toBeDefined();