osgi: various updates for JRuby bundles

* Export the root of the deployed plugin (useful to find config files, etc.)
* Export root and logger to the ruby plugin
* Add various Import-Package entries to make OpenSSL work

Signed-off-by: Pierre-Alexandre Meyer <pierre@ning.com>
Merge branch 'new-paymentpluginapi' of github.com:killbill/killbill into new-paymentpluginapi