change CapturePacket header guard to be unique

per review, comment end of header guard

This closes #689.

Signed-off-by: Marc Parisi <phrocker@apache.org>
diff --git a/extensions/pcap/CapturePacket.h b/extensions/pcap/CapturePacket.h
index 6dfd276..26f499a 100644
--- a/extensions/pcap/CapturePacket.h
+++ b/extensions/pcap/CapturePacket.h
@@ -16,8 +16,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-#ifndef __INVOKE_HTTP_H__
-#define __INVOKE_HTTP_H__
+#ifndef EXTENSIONS_CAPTUREPACKET_H
+#define EXTENSIONS_CAPTUREPACKET_H
 
 #include <memory>
 #include <regex>
@@ -175,4 +175,4 @@
 } /* namespace apache */
 } /* namespace org */
 
-#endif
+#endif /* EXTENSIONS_CAPTUREPACKET_H */