Add smack-java7 declarative service

So that everything is correctly initialized. Otherwise we get an NPE
like:

02:55:01 PM SENT (242792115): <auth xmlns='urn:ietf:params:xml:ns:xmpp-sasl' mechanism='DIGEST-MD5'>=</auth>
02:55:01 PM RCV  (242792115): <challenge xmlns="urn:ietf:params:xml:ns:xmpp-sasl">cmVhbG09ImVjLXhtcHAiLG5vbmNlPSJyWWpCYj Znc1I4WUVKZXNZUXV2bXBFQWNoRVVGRGowTnJnUFcxRjFmIixxb3A9ImF1dGgiLGNoYXJzZXQ9dXRmLT gsYWxnb3JpdGhtPW1kNS1zZXNz</challenge>
org.jivesoftware.smack.SmackException$NoResponseException
    at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java: 247)
    at org.jivesoftware.smack.tcp.XMPPTCPConnection.login(XMPPTCPConnection.java:374)
    ...
    at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.ja va:932)
    at org.osgi.util.tracker.ServiceTracker$Tracked.customizerAdding(ServiceTracker.ja va:1)
    at org.osgi.util.tracker.AbstractTracked.trackAdding(AbstractTracked.java:256)
    at org.osgi.util.tracker.AbstractTracked.trackInitial(AbstractTracked.java:183)
    at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:317)
    at org.osgi.util.tracker.ServiceTracker.open(ServiceTracker.java:261)
    at com.foobar.mgmt.tree.xmpp.skeleton.impl.activator.Activator.start(Activator.ja va:33)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextI mpl.java:711)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(Bundl eContextImpl.java:702)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextI mpl.java:683)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java :381)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.j ava:390)
    at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java: 1176)
    at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartL evelManager.java:559)
    at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartL evelManager.java:544)
    at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelMa nager.java:457)
    at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(Star tLevelManager.java:243)
    at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartL evelManager.java:438)
    at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartL evelManager.java:1)
    at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.jav a:230)
    at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.j ava:340)
Sep 18, 2014 2:55:06 PM org.jivesoftware.smack.AbstractXMPPConnection callConnectionClosedOnErrorListener
Warnung: Connection closed with error
java.lang.NullPointerException
    at org.jivesoftware.smack.util.stringencoder.Base64.decode(Base64.java:87)
    at org.jivesoftware.smack.sasl.SASLMechanism.challengeReceived(SASLMechanism.java: 206)
    at org.jivesoftware.smack.SASLAuthentication.challengeReceived(SASLAuthentication. java:325)
    at org.jivesoftware.smack.SASLAuthentication.challengeReceived(SASLAuthentication. java:310)
    at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.parsePackets(XMPPTCPC onnection.java:1105)
    at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader.access$200(XMPPTCPCon nection.java:969)
    at org.jivesoftware.smack.tcp.XMPPTCPConnection$PacketReader$1.run(XMPPTCPConnecti on.java:988)

SMACK-343