DDF-46: Had to change some dependency versions and update code to work with the newer dependency versions.

Most of the changes due to OSGi now using generics and jetty being upgraded.
DDF-43: Added features for Cellar 2.3.0 and updated version number in pom
DDF-46: Updated properties to remove xalan and xerces jars from system bundle.
DDF-46: Added bouncycastle as the default security provider.
DDF-46 Updated the solr server pom to import the javax.net.ssl package.
DDF-46 Updated to specify and handle the Password metatype - removing metatype defaults, configuring via blueprint if necessary.
Updated slf4j version from 1.6.1 to 1.7.1.
Updated servicemix specs version from 2.0.0 to 2.2.0.
Added dependency for pax exam tooling to the top level ddf.pom.
Replaced etc config files with corresponding 2.3.1 version (applying changes if necessary).
Removed backporting changes to itests pom - new current versions work without changes.
Put password defaults into the blueprint files rather than the metatypes.
Updated necessary metatype files (handling new Password type) to use metatype v1.2.0.
DDF-46 Backported fixes for webconsole plugins from KARAF-2285 into the 2.3.1 branch, updated features to reference these plugins.
Added webconsole-plugins module which includes the admin, features, and gogo webconsole plugins from the karaf 2.3.x branch.
Created the ddf-webconsole feature to mirror the webconsole feature but call out these new webconsole-plugins.
Reflected the change in features throughout the packaging.