Bug 417869 - Avoid adding dev class path entries that are dups

There are cases where PDE will add class path to the dev settings which
are duplicate paths specified on the Bundle-ClassPath header. The
DevClassLoadingHook should avoid doing adding the duplicate paths which
the framework will add itself.

Change-Id: Ie069f2bbf137a2de16fe1168d251669843266cb6
4 files changed