Bug 444988 - Workspace can exit with unsaved changes because of modification of External Plug-in Libraries/.searchable during FULL_SAVE

Change-Id: I9b76064b4473b59e2c857ae58ad10cd1a5dadd26
Signed-off-by: Szymon Ptaszkiewicz <szymon.ptaszkiewicz@pl.ibm.com>