Remove org.apache.karaf.shell config from ssh feature

Feature ssh still sets config:
<config name="org.apache.karaf.shell">
sshPort=8101
sshHost=0.0.0.0
sshRealm=karaf
hostKey=${karaf.etc}/host.key
</config>

The config for "org.apache.karaf.shell.cfg" is set twice in the standard feature file causing a mess up in the result (distribution). It has been removed from trunk in KARAF-5074 yet.