Add CloudSigma2 providers

Backports https://github.com/jclouds/jclouds-karaf/pull/59 and https://github.com/jclouds/jclouds-karaf/pull/58, fixing the versions to the ones in the 1.8.x branch.

Also adds some missing features and sorts them alphabetically, as they are in master.

/cc @ccustine