Add Mojos to replace "The Eclipse Test Framework"

The Eclipse Test Framework is a way to specifically run a test inside an
eclipse installation itself against a prebuild SDK.

This implements the framework on top of maven to make it much easier to
run and setup than with the several (ant) prerequsites of the original
description provided here:

- https://wiki.eclipse.org/Platform-releng/Eclipse_Test_Framework#Headless_Testing_vs._UI_testing
- https://wiki.eclipse.org/Platform-releng/Automated_Testing

as well as offer much more flexibility e.g. to run tests in a local mode
where not the SDK but a local build is used as the test base.

tycho-eclipse-plugin/src/main/java/org/eclipse/tycho/eclipsetest/AbstractEclipseTestMojo.java

@@ -0,0 +1,15 @@
+package org.eclipse.tycho.eclipsetest;
+
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.MojoFailureException;
+
+public class AbstractEclipseTestMojo extends AbstractMojo {
+
+	@Override
+	public void execute() throws MojoExecutionException, MojoFailureException {
+		// TODO Auto-generated method stub
+
+	}
+
+}

tycho-eclipse-plugin/src/main/java/org/eclipse/tycho/eclipsetest/EclipseCoreTestMojo.java

@@ -0,0 +1,17 @@
+package org.eclipse.tycho.eclipsetest;
+
+import org.apache.maven.plugins.annotations.LifecyclePhase;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.ResolutionScope;
+
+/**
+ * This Mojo provides the <a href=
+ * "https://wiki.eclipse.org/Platform-releng/Eclipse_Test_Framework">Eclipse
+ * Test Framework</a> to maven and is a replacement for the <a href=
+ * "https://wiki.eclipse.org/Platform-releng/Eclipse_Test_Framework#Headless_Testing_vs._UI_testing"><code>core-test</code></a>
+ * ant target.
+ */
+@Mojo(name = "eclipse-core-test", defaultPhase = LifecyclePhase.INTEGRATION_TEST, threadSafe = true, requiresDependencyCollection = ResolutionScope.COMPILE_PLUS_RUNTIME)
+public class EclipseCoreTestMojo extends AbstractEclipseTestMojo {
+
+}

tycho-eclipse-plugin/src/main/java/org/eclipse/tycho/eclipsetest/EclipseUITestMojo.java

@@ -0,0 +1,17 @@
+package org.eclipse.tycho.eclipsetest;
+
+import org.apache.maven.plugins.annotations.LifecyclePhase;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.ResolutionScope;
+
+/**
+ * This Mojo provides the <a href=
+ * "https://wiki.eclipse.org/Platform-releng/Eclipse_Test_Framework">Eclipse
+ * Test Framework</a> to maven and is a replacement for the <a href=
+ * "https://wiki.eclipse.org/Platform-releng/Eclipse_Test_Framework#Headless_Testing_vs._UI_testing"><code>ui-test</code></a>
+ * ant target.
+ */
+@Mojo(name = "eclipse-ui-test", defaultPhase = LifecyclePhase.INTEGRATION_TEST, threadSafe = true, requiresDependencyCollection = ResolutionScope.COMPILE_PLUS_RUNTIME)
+public class EclipseUITestMojo extends AbstractEclipseTestMojo {
+
+}