Add missing features repositories in platform pom.xml.

Platform pom.xml is used to build the distribution local repository (system folder).

Following this website recommendations
http://fusesource.com/docs/esb/4.4/esb_deploy_osgi/Locate-CustomRepo.html
all featuresRepositories used in org/apache/servicemix/apache-servicemix/${servicemix.version}/etc/org.apache.karaf.features.cfg
have been addded to platform pom.xml.

With the complete featureRepositories list, generated system folder contains all required bundles.
As a result, platform can be launched offline and all bundles are resolved from its system folder.

As a side effect, OpenNaaS loads in less than 1 minute (50s aprox.) the first time it is launched from a clean distribution.
It took around 4 minutes before this fix.
I guess this will also reduce the time needed to launch itests.
Remove jetty-all-server unused dependency from parent pom.xml
Merge pull request #693 from isartcanyameres/hotfix/offline-ready-distro

Hotfix/offline ready distro