DATAMONGO-1558 - Upgrade MongoDB server version to, and add build profile for MongoDB 3.4.

Added MongoDB 3.4 profile to pom.xml and upgraded to MongoDB 3.4 on travis-ci.
Delete assertion checking property that has been removed in MongoDB 3.4 (see: https://jira.mongodb.org/browse/SERVER-24928)

.travis.yml

@@ -14,6 +14,7 @@ env:
     - PROFILE=mongo31
     - PROFILE=mongo32
     - PROFILE=mongo33
+    - PROFILE=mongo34
     - PROFILE=mongo34-next
 
 # Current MongoDB version is 2.4.2 as of 2016-04, see https://github.com/travis-ci/travis-ci/issues/3694
@@ -21,7 +22,7 @@ env:
 addons:
   apt:
     sources:
-    - mongodb-3.2-precise
+    - mongodb-3.4-precise
     packages:
     - mongodb-org-server
     - mongodb-org-shell

pom.xml

@@ -173,11 +173,20 @@
 
 		</profile>
 
+		<profile>
+
+			<id>mongo34</id>
+			<properties>
+				<mongo>3.4.0</mongo>
+			</properties>
+
+		</profile>
+
 		<profile>
 
 			<id>mongo34-next</id>
 			<properties>
-				<mongo>3.4.0-SNAPSHOT</mongo>
+				<mongo>3.4.1-SNAPSHOT</mongo>
 			</properties>
 
 			<repositories>

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/ReactiveMongoTemplateExecuteTests.java

@@ -121,7 +121,7 @@ public class ReactiveMongoTemplateExecuteTests {
 		subscriber.awaitAndAssertNextValueCount(1);
 		subscriber.assertValuesWith(document -> {
 
-			assertThat(document, hasKey("waitedMS"));
+			assertThat(document.get("ok", Double.class), is(closeTo(1D, 0D)));
 			assertThat(document, hasKey("cursor"));
 		});
 	}