add missing Import-Package instructions (#1545)

Signed-off-by: Markus Rathgeb <maggu2810@gmail.com>

extensions/binding/org.eclipse.smarthome.binding.digitalstrom/META-INF/MANIFEST.MF

@@ -9,6 +9,8 @@ Bundle-ClassPath: .
 Import-Package: com.google.common.collect,
  com.google.gson,
  javax.jmdns,
+ javax.net.ssl,
+ javax.xml.bind,
  org.apache.commons.io,
  org.apache.commons.lang,
  org.eclipse.smarthome.config.core,