3.4.2 bundler resolution fix

Maked the thing work for 3.4.2

The problem is the version of jsch library we used. We had a jar one and eclipse has one in a bundle somewhere. jGit uses the same library, but for 3.4.2 the version was different. This cause Equinox to refuse to load our bundle because of the version conflict (we were exporting the same packages,but with a different version, and we were using jGit, so we already had a version of jsch loaded, and the whole thing would blow up.

Once discovered, the fix was trivial. I made our plugin depend on the bundled jsch, and removed the jar
from the third party plugin. Now everything resolves and should resolve for a long time, even with different updates.