Making Travis happy

The Github-based CI server (Travis), tends to run out of resources quickly.
This commit adds a new optional flag that allows the build to skip tests that
are known to be resource intensive.
Example usage: ant -DskipResourceIntensiveTests=true clean test

This change also splits up build steps distinct Travis environments. This
helps to isolate resource usage, as well as speed things up (as things run
in parallel now)

.travis.yml

@@ -2,4 +2,11 @@ sudo: false
 language: java
 jdk:
   - oraclejdk8
-script: ant -Dhalt.on.plugin.error=true -f build/build.xml openfire test plugins
+env:
+  - ENVTARGET=compile
+  - ENVTARGET=test
+  - ENVTARGET=openfire
+  - ENVTARGET=plugins
+
+script: ant -Dhalt.on.plugin.error=true -f build/build.xml clean $ENVTARGET 
+

build/build.xml

@@ -215,6 +215,7 @@
 
     <patternset id="test.sources">
         <include name="**/*Test.java"/>
+        <exclude name="**/CheckChainTrustedTest.java" if="skipResourceIntensiveTests"/>
     </patternset>
 
     <patternset id="web.sources">

src/test/java/org/jivesoftware/openfire/keystore/CheckChainTrustedTest.java

@@ -16,7 +16,6 @@ import java.util.List;
  *
  * @author Guus der Kinderen, guus.der.kinderen@gmail.com
  */
-@Ignore // These tests make the continuous integration on GitHub (Travis) fail.
 @RunWith( Parameterized.class )
 public class CheckChainTrustedTest
 {