Delete code of abandoned equinox plug-ins

Delete the following projects that are abandoned (and not build) for a
while:

Part 1 (background https://bugs.eclipse.org/bugs/show_bug.cgi?id=533801)
- bundles/org.eclipse.equinox.io
- bundles/org.eclipse.equinox.ip
- bundles/org.eclipse.equinox.util
- bundles/org.eclipse.equinox.wireadmin

Part 2 (background https://bugs.eclipse.org/bugs/show_bug.cgi?id=348045)
- bundles/org.eclipse.equinox.servletbridge.extensionbundle
- features/org.eclipse.equinox.server.servletbridge
- bundles/org.eclipse.equinox.servletbridge.template

Part 3:
- bundles/org.eclipse.equinox.compendium.tests
- bundles/org.eclipse.equinox.http.jetty.starter

Signed-off-by: Hannes Wellmann <[email protected]>