SLING-6079 commons.messaging.mail build fails on Jenkins

add Maven repository apache-snapshots to base configuration

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1762888 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/test/java/org/apache/sling/commons/messaging/mail/MailTestSupport.java b/src/test/java/org/apache/sling/commons/messaging/mail/MailTestSupport.java
index a1edb6c..834b3b8 100644
--- a/src/test/java/org/apache/sling/commons/messaging/mail/MailTestSupport.java
+++ b/src/test/java/org/apache/sling/commons/messaging/mail/MailTestSupport.java
@@ -36,6 +36,7 @@
 import static org.ops4j.pax.exam.CoreOptions.mavenBundle;
 import static org.ops4j.pax.exam.CoreOptions.options;
 import static org.ops4j.pax.exam.CoreOptions.provision;
+import static org.ops4j.pax.exam.CoreOptions.repository;
 import static org.ops4j.pax.exam.CoreOptions.wrappedBundle;
 
 public abstract class MailTestSupport {
@@ -78,6 +79,7 @@
     protected Option[] baseConfiguration() {
         final String filename = System.getProperty("bundle.filename");
         return options(
+            repository("https://repository.apache.org/snapshots/").id("apache-snapshots").allowSnapshots(),
             junitBundles(),
             provision(
                 wrappedBundle(mavenBundle().groupId("org.subethamail").artifactId("subethasmtp").versionAsInProject()),