gradle: Use BndPlugin.gradle from bnd jar
gradle: Use BndPlugin.gradle from bnd jar

Since we now build with a version of bnd jar which includes the BndPlugin
gradle script, we now load the script from the bnd jar instead of the
workspace.

mcculls/bnd,psoreide/bnd,GEBIT/bnd,psoreide/bnd,magnet/bnd,GEBIT/bnd,magnet/bnd,joansmith/bnd,mcculls/bnd,lostiniceland/bnd,lostiniceland/bnd,xtracoder/bnd,lostiniceland/bnd,magnet/bnd,xtracoder/bnd,joansmith/bnd,psoreide/bnd,mcculls/bnd