preferences only when defaults are not used

Modified the current fix to have 2 quick fixes available.
1) Enable Preview features in project preferences if present or
workspace preferences and rebuild.
2) open corresponding preference/properties page as before.

Change-Id: I9a65605fd0db186757c586c1bfa8ef7e0ea94f6c
Signed-off-by: Kalyan Prasad Tatavarthi <kalyan_prasad@in.ibm.com>