added missing versions for features and fixed assembly of jetty certificate bundle (#547)

Signed-off-by: Kai Kreuzer <kai@openhab.org>

bundles/org.openhab.core.io.jetty.certificate/bnd.bnd

@@ -1,2 +1,3 @@
 Bundle-SymbolicName: ${project.artifactId}
 Bundle-Activator: org.openhab.io.jetty.certificate.internal.CertificateGenerator
+Import-Package: !org.bouncycastle.*,*

bundles/org.openhab.core.io.jetty.certificate/pom.xml

@@ -16,7 +16,6 @@
       <groupId>org.bouncycastle</groupId>
       <artifactId>bcpkix-jdk15on</artifactId>
       <version>1.52</version>
-      <scope>provided</scope>
     </dependency>
   </dependencies>
 
@@ -25,7 +24,13 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
-        <version>2.4.1</version>
+        <version>3.2.1</version>
+        <executions>
+          <execution>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <phase>package</phase>
             <configuration>
               <artifactSet>
                 <includes>
@@ -50,12 +55,6 @@
                 </transformer>
               </transformers>
             </configuration>
-        <executions>
-          <execution>
-            <goals>
-              <goal>shade</goal>
-            </goals>
-            <phase>package</phase>
           </execution>
         </executions>
       </plugin>

features/karaf/openhab-core/pom.xml

@@ -14,6 +14,12 @@
   <name>openHAB Core :: Features :: Karaf :: Core</name>
   <description>openHAB Core Features</description>
 
+  <properties>
+    <jetty.version>9.4.12.v20180830</jetty.version>
+    <jna.version>4.5.2</jna.version>
+    <nrjavaserial.version>3.15.0.OH2</nrjavaserial.version>
+  </properties>
+
   <build>
     <plugins>
       <plugin>