[PAXWICKET-320] Add missing license headers

...in preparation for 0.8.5

Signed-off-by: Andreas Pieber <anpieber@gmail.com>

service/src/main/java/org/ops4j/pax/wicket/internal/util/BundleTrackerAggregator.java

@@ -1,3 +1,18 @@
+/**
+ * Copyright OPS4J
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.ops4j.pax.wicket.internal.util;
 
 import org.osgi.framework.BundleContext;

service/src/main/java/org/ops4j/pax/wicket/internal/util/ServiceTrackerAggregatorReadyChildren.java

@@ -1,3 +1,18 @@
+/**
+ * Copyright OPS4J
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.ops4j.pax.wicket.internal.util;
 
 import org.osgi.framework.ServiceReference;