Developer setup updates for Oxygen

- Update Papyrus-RT to Oxygen
- DSML Validation feature is renamed in Oxygen
- update UML2 to Oxygen
diff --git a/content/setup/papyrus-rt-developer.setup b/content/setup/papyrus-rt-developer.setup
index 2645929..9556761 100644
--- a/content/setup/papyrus-rt-developer.setup
+++ b/content/setup/papyrus-rt-developer.setup
@@ -24,8 +24,6 @@
         name="org.eclipse.papyrusrt.feature.feature.group"/>
     <requirement
         name="org.eclipse.papyrus.sdk.feature.feature.group"/>
-    <requirement
-        name="org.eclipse.papyrus.extra.dsml.validation.feature.feature.group"/>
   </setupTask>
   <setupTask
       xsi:type="setup.p2:P2Task"
@@ -1393,6 +1391,8 @@
         location="${jre.location-1.7}"/>
     <setupTask
         xsi:type="setup.p2:P2Task">
+      <requirement
+          name="org.eclipse.papyrus.extra.dsml.validation.feature.feature.group"/>
       <repository
           url="https://hudson.eclipse.org/papyrus-rt/job/Papyrus-RT-Mars-All/lastSuccessfulBuild/artifact/repository/"/>
       <repository
@@ -1423,6 +1423,8 @@
         location="${jre.location-1.8}"/>
     <setupTask
         xsi:type="setup.p2:P2Task">
+      <requirement
+          name="org.eclipse.papyrus.extra.dsml.validation.feature.feature.group"/>
       <repository
           url="${base.downloads.url}/papyrus-rt/updates/nightly/neon/"/>
       <repository
@@ -1449,12 +1451,14 @@
         location="${jre.location-1.8}"/>
     <setupTask
         xsi:type="setup.p2:P2Task">
+      <requirement
+          name="org.eclipse.papyrus.dsml.validation.feature.feature.group"/>
       <repository
-          url="${base.downloads.url}/papyrus-rt/updates/nightly/neon/"/>
+          url="${base.downloads.url}/papyrus-rt/updates/nightly/oxygen/"/>
       <repository
-          url="${base.downloads.url}/modeling/mdt/papyrus/updates/${papyrus.buildtype}/neon/"/>
+          url="${base.downloads.url}/modeling/mdt/papyrus/updates/${papyrus.buildtype}/oxygen/"/>
       <repository
-          url="${base.downloads.url}/modeling/mdt/uml2/updates/5.2.x/"/>
+          url="${base.downloads.url}/modeling/mdt/uml2/updates/5.3milestones/"/>
       <repository
           url="https://hudson.eclipse.org/papyrus/job/papyrus-incubation-oxygen/lastSuccessfulBuild/artifact/org.eclipse.papyrus.incubation.p2/target/repository/"/>
     </setupTask>