hg: jigsaw/jigsaw/jdk: Correct the test to determine if it's a development build vs image build

[mandy.chung at oracle.com]

Changeset: e3ad33822fa3
Author:    mchung
Date:      2012-10-11 15:48 -0700
URL:       http://hg.openjdk.java.net/jigsaw/jigsaw/jdk/rev/e3ad33822fa3

Correct the test to determine if it's a development build vs image build

! make/common/Modules.gmk
! src/share/classes/org/openjdk/jigsaw/ClassPathContext.java
! test/ModulesProblemList.txt