[pre-test]OSGi: OSGi and bnd version updates and - Cleanups

[stbischof]

Separate PR to update bnd and osgi as discussed here #9361 and #9321

[denis-anisimov]

@stbischof , osgi repo is not public: https://github.com/vaadin/osgi
All OSGi related code is moved now there and Flow repo doesn't contain OSGi specific code anymore except config for manifest files.

the master branch in osgi repo is protected and validation is enabled.
Please :

• rebase the changes against the master branch.
• check that validation in osgi repo passes

Since this PR is for Flow and doesn't touch OSGi related code you should run the validation by yourself in the https://github.com/vaadin/osgi/tree/master/test-containers/felix-jetty.
You don't need to run all the tests. Just check that there are no errors and check at least one view.

Please make all OSGi related code PRs now in osgi repo. Thanks.

[pleku]

Closed as for the OSGi support is in its own public repository since version 6.0.