Use o.e.equinox.executable.feature.group in pde.build.tests

instead of the artificial (to be removed) unit
'org.eclipse.equinox.executable'.
Because the p2.mirror-task that sets up the test environment in the
test.xml is configured with 'followOnlyFilteredRequirements="true"' the
redirection mechanism of the new definition of
'org.eclipse.equinox.executable' does not work.

Additionally print where the executable was found, just for information.

Fixes #1884

Author: HannesWell

build/org.eclipse.pde.build.tests/pom.xml

@@ -69,7 +69,7 @@
 										<iu><id>org.eclipse.rcp.feature.group</id></iu>
 										<iu><id>org.eclipse.platform.feature.group</id></iu>
 										<iu><id>org.eclipse.jdt.feature.group</id></iu>
-										<iu><id>org.eclipse.equinox.executable</id></iu>
+										<iu><id>org.eclipse.equinox.executable.feature.group</id></iu>
 										<iu><id>org.eclipse.e4.rcp.feature.group</id></iu>
 									</ius>
 									<includeOptional>false</includeOptional>

build/org.eclipse.pde.build.tests/src/org/eclipse/pde/build/internal/tests/Utils.java

@@ -362,6 +362,7 @@ public static File findExecutable() throws IOException {
 
 		executableLocation = findExecutable(baseLocation);
 		if (executableLocation != null) {
+			System.out.println("Found the executable at: " + executableLocation);
 			return executableLocation;
 		}
 
@@ -377,6 +378,7 @@ public static File findExecutable() throws IOException {
 					URI location = bundle.getLocation();
 					executableLocation = findExecutable(URIUtil.toFile(URIUtil.append(location, "../..")));
 					if (executableLocation != null) {
+						System.out.println("Found the executable at: " + executableLocation);
 						return executableLocation;
 					}
 					break;
@@ -393,6 +395,7 @@ public static File findExecutable() throws IOException {
 		File fallback1 = new File(baseLocation.getParentFile(), "deltapack/eclipse");
 		executableLocation = findExecutable(fallback1);
 		if (executableLocation != null) {
+			System.out.println("Found the executable at: " + executableLocation);
 			return executableLocation;
 		}
 		if (Platform.OS.isMac()) {
@@ -406,6 +409,7 @@ public static File findExecutable() throws IOException {
 		executableLocation = findExecutable(fallback2);
 		assertNotNull("All attempts to find the executable failed including fallback to " + fallback1.getAbsolutePath()
 				+ " or to " + fallback2.getAbsolutePath(), executableLocation);
+		System.out.println("Found the executable at: " + executableLocation);
 		return executableLocation;
 	}
 

build/org.eclipse.pde.build.tests/test.xml

@@ -150,7 +150,7 @@
         id="org.eclipse.jdt.feature.group"
         version="" />
       <iu
-        id="org.eclipse.equinox.executable"
+        id="org.eclipse.equinox.executable.feature.group"
         version="" />
       <iu
         id="org.eclipse.e4.rcp.feature.group"