Fix test failure in testsuite-osgi-deps

This commit fixes both failure of test itself and failure of compiling
and running test.

- When the test was run via 'mvn test', Maven gives karaf-maven-plugin a
  list of class directories instead of OSGi bundles, so that
  karaf-maven-plugin generates incorrect feature.xml.  I added a
  workaround for this specific case to DependencyIT
- When the packaging of project is 'feature', maven-compiler-plugin is
  not run at all.  Added a <plugin/> section so that it's always
  compiled.

testsuite-osgi/testsuite-osgi-deps/pom.xml

@@ -105,8 +105,27 @@
   </dependencies>
 
   <build>
-
     <plugins>
+      <!-- feature doesn't invoke maven-compile-plugin unless specified explicitly. -->
+      <plugin>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>compile</id>
+            <phase>compile</phase>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>test-compile</id>
+            <phase>test-compile</phase>
+            <goals>
+              <goal>testCompile</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
 
       <!-- produce karaf feature.xml -->
       <plugin>

testsuite-osgi/testsuite-osgi-deps/src/test/java/io/netty/verify/osgi/DependencyIT.java

@@ -15,18 +15,25 @@
  */
 package io.netty.verify.osgi;
 
-import static org.junit.Assert.*;
-
-import java.io.File;
-
+import io.netty.util.internal.StringUtil;
+import io.netty.util.internal.logging.InternalLogger;
+import io.netty.util.internal.logging.InternalLoggerFactory;
 import org.apache.commons.io.FileUtils;
 import org.junit.Test;
 
+import java.io.File;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.*;
+
 /**
  * Dependency Integration Tests.
  */
 public class DependencyIT {
 
+    private static final InternalLogger logger = InternalLoggerFactory.getInstance(DependencyIT.class);
+
     /**
      * Default location of generated karaf features file.
      * <p>
@@ -35,19 +42,28 @@ public class DependencyIT {
      * >karaf-maven-plugin</a>
      */
     public static final String FEATURE = "./target/feature/feature.xml";
+    private static final Pattern WRAPPED_MODULE_PATTERN = Pattern.compile("wrap:mvn:io\\.netty/");
 
     @Test
     public void verifyKarafFeatureHasNoWrapProtocol() throws Exception {
+        String text = FileUtils.readFileToString(new File(FEATURE));
 
-        final File file = new File(FEATURE);
-
-        final String text = FileUtils.readFileToString(file);
+        // Ignore wrap:mvn:io.netty - it occurs when Maven didn't give the Netty modules to karaf-maven-plugin
+        // as class directories.
+        Matcher matcher = WRAPPED_MODULE_PATTERN.matcher(text);
+        if (matcher.find()) {
+            text = matcher.replaceAll("mvn:io.netty/");
+            logger.info("Ignored wrap:mvn:io.netty");
+        }
 
         if (text.contains("wrap:")) {
-            System.err.println(text);
-            fail("karaf feature.xml contains 'wrap:' protocol: some transitive dependencies are not osgi bundles");
+            fail(
+                    "feature.xml generated by karaf-maven-plugin contains 'wrap:' protocol; " +
+                    "some transitive dependencies are not OSGi bundles: " + StringUtil.NEWLINE +
+                    text
+            );
         } else {
-            System.out.println("all transitive dependencies are osgi bundles");
+            logger.info("All transitive dependencies are OSGi bundles.");
         }
     }
 }