[releng] Switch to Oxygen.3a RC2 of Platform and Orbit

Change-Id: I91274ba943307e68ebf37ec65276cddf7f0927f1
Signed-off-by: Andreas Sewe <andreas.sewe@codetrails.com>
diff --git a/releng/targets/oxygen/oxygen.target b/releng/targets/oxygen/oxygen.target
index ffda123..79fdafb 100644
--- a/releng/targets/oxygen/oxygen.target
+++ b/releng/targets/oxygen/oxygen.target
@@ -6,8 +6,8 @@
 <unit id="org.eclipse.ecf.filetransfer.feature.feature.group" version="0.0.0"/>
 <unit id="org.eclipse.equinox.p2.sdk.feature.group" version="0.0.0"/>
 <unit id="org.eclipse.sdk.ide" version="0.0.0"/>
-<!-- Stable platform build for Oxygen.3 RC2 -->
-<repository location="http://download.eclipse.org/eclipse/updates/4.7-M-builds/M-4.7.3RC2-201802150545/"/>
+<!-- Stable platform build for Oxygen.3a RC2 -->
+<repository location="http://download.eclipse.org/eclipse/updates/4.7-M-builds/M-4.7.3aRC2-201803300640/"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.emf.sdk.feature.group" version="0.0.0"/>
@@ -42,8 +42,8 @@
 <unit id="org.objenesis" version="1.0.0.v201505121915"/>
 <unit id="org.slf4j.api" version="1.7.2.v20121108-1250"/>
 <unit id="org.yaml.snakeyaml" version="1.14.0.v201604211500"/>
-<!-- Stable Orbit build for Oxygen.3 RC1 -->
-<repository location="http://download.eclipse.org/tools/orbit/downloads/drops/M20180206163158/repository"/>
+<!-- Stable Orbit build for Oxygen.3a RC2 -->
+<repository location="http://download.eclipse.org/tools/orbit/downloads/drops/M20180330011457/repository"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.swtbot.feature.group" version="2.2.1.201402241301"/>