remove oxygen target platform (#3590)

* remove oxygen target platform

Author: elharo

.travis.yml

@@ -16,10 +16,6 @@ install:
 # We run jacoco on photon
 matrix:
   include:
-    - name: "Eclipse Oxygen (4.7) on Java 8"
-      jdk: oraclejdk8
-      dist: trusty
-      env: ECLIPSE_TARGET=oxygen
     - name: "Eclipse Photon (4.8) on Java 8"
       jdk: oraclejdk8
       dist: trusty

README.md

@@ -78,9 +78,9 @@ The tests need to find the Google Cloud SDK.  You can either:
 
 By default, the build is targeted against Eclipse Photon / 4.8.
 You can explicitly set the `eclipse.target` property to
-`oxygen` (4.7), `2018-09` (4.9), or `2018-12` (4.10).
+`2018-09` (4.9), or `2018-12` (4.10).
 ```
-$ mvn -Declipse.target=oxygen package
+$ mvn -Declipse.target=2018-09 package
 ```
 
 ### Adding a new bundle/fragment
@@ -265,7 +265,6 @@ features being built against. We currently maintain three target platforms,
 targeting the latest version of the current, previous, and next releases.
 This is currently:
 
-  - Eclipse Oxygen (4.7): [`eclipse/oxygen/gcp-eclipse-oxygen.target`](eclipse/oxygen/gcp-eclipse-oxygen.target)
   - Eclipse Photon (4.8): [`eclipse/photon/gcp-eclipse-photon.target`](eclipse/photon/gcp-eclipse-photon.target)
   - Eclipse 2018-09 (4.9): [`eclipse/eclipse-2018-09/gcp-eclipse-2018-09.target`](eclipse/eclipse-2018-09/gcp-eclipse-2018-09.target)
   - Eclipse 2018-12 (4.10): [`eclipse/eclipse-2018-12/gcp-eclipse-2018-12.target`](eclipse/eclipse-2018-12/gcp-eclipse-2018-12.target)

eclipse/oxygen/.settings/org.eclipse.core.resources.prefs

@@ -14,7 +14,6 @@
   <packaging>pom</packaging>
 
   <modules>
-    <module>oxygen</module>
     <module>photon</module>
     <module>eclipse-2018-09</module>
     <module>eclipse-2018-12</module>

eclipse/oxygen/.settings/org.eclipse.m2e.core.prefs

@@ -414,40 +414,6 @@
       </properties>
     </profile>
 
-    <profile>
-      <id>build-eclipse-oxygen</id>
-      <activation>
-        <property>
-          <name>eclipse.target</name> <value>oxygen</value>
-        </property>
-      </activation>
-      <properties>
-         <jettyMinVersion>9.3</jettyMinVersion>
-         <jettyMaxVersion>9.5</jettyMaxVersion>
-      </properties>
-      <!-- build against a known target platform -->
-      <modules>
-        <module>eclipse/oxygen</module>
-      </modules>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.eclipse.tycho</groupId>
-            <artifactId>target-platform-configuration</artifactId>
-            <configuration>
-            <target>
-              <artifact>
-                <groupId>com.google.cloud.tools.eclipse</groupId>
-                <artifactId>gcp-eclipse-oxygen</artifactId>
-                <version>4.7.0-SNAPSHOT</version>
-              </artifact>
-            </target>
-           </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-
     <profile>
       <id>build-eclipse-photon</id>
       <activation>