Updating jsch.agentproxy 0.0.7 -> 0.0.8

See https://github.com/jclouds/jclouds/pull/533. This is blocked (and will fail) on the ServiceMix bundle push:

http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22org.apache.servicemix.bundles.jsch-agentproxy-sshj%22