[travis] Updates Travis Maven and enforces Maven version (#1392)

* Enforce not using Maven 3.6.2

* Use Maven 3.6.3 via Maven wrapper for Travis

.travis.yml

@@ -30,16 +30,17 @@ addons:
   hostname: myshorthost
   postgresql: "9.5"
 
-install: mvn install -q -DskipTests=true
+install:
+  - mvn -N io.takari:maven:0.7.7:wrapper -Dmaven=3.6.3
+  - ./mvnw install -q -DskipTests=true
 
-script: mvn test -q
+script: ./mvnw test -q
 
 before_script:
   - psql -c 'CREATE database test;' -U postgres
   - psql -c 'CREATE TABLE usertable (YCSB_KEY VARCHAR(255) PRIMARY KEY not NULL, YCSB_VALUE JSONB not NULL);' -U postgres -d test
   - psql -c 'GRANT ALL PRIVILEGES ON DATABASE test to postgres;' -U postgres
 
-
 # Services to start for tests.
 services:
   - ignite
@@ -48,6 +49,5 @@ services:
 # temporarily disable riak. failing, docs offline.
 #  - riak
 
-
 # Can't use container based infra because of hosts/hostname
 sudo: true

pom.xml

@@ -237,7 +237,11 @@ LICENSE file.
             <configuration>
               <rules>
                 <requireMavenVersion>
-                  <version>3.1.0</version>
+                  <!--
+                  Maven 3.6.2 has issues
+                  https://github.com/brianfrankcooper/YCSB/issues/1390
+                  -->
+                  <version>[3.1.0,3.6.2),(3.6.2,)</version>
                 </requireMavenVersion>
               </rules>
             </configuration>