Update surefire version and enable tests

Author: optionsome

Dockerfile.builder

@@ -12,4 +12,4 @@ ADD src ${OTP_ROOT}/src
 add .git ${OTP_ROOT}/.git
 
 # Build OTP
-RUN mvn package -DskipTests
+RUN mvn package

pom.xml

@@ -257,8 +257,9 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.21.0</version>
-                <configuration>
+                <!-- Fixes issue with tests failing in some environments. Replace this when proper version of 3.0 is released. -->
+                <version>3.0.0-M1</version>
+		<configuration>
                     <argLine>-Xmx4G</argLine>
                     <!-- Jenkins needs XML test reports to determine whether the build is stable. -->
                     <disableXmlReport>false</disableXmlReport>