Bug 444188: Fix concurrent access to listener collections

EclipsePreferences is now thread-safe.

A new test bundle is created to test org.eclipse.equinox.preferences
Moving tests from
org.eclipse.core.tests.internal.preferences.EclipsePreferencesTest is
not done here.


Signed-off-by: Vasili Gulevich <vasili.gulevich@xored.com>
Signed-off-by: Michelle Stolwyk <Michelle.Stolwyk@intersystems.com>
Change-Id: Ie3f264a2b7766e574bf65ca0cba3648ce76ac458
16 files changed