Fix wrong classpaths

In PR-2350 Matthias Bläsing suggest a fix. This fix was about the wrong use of ${nb_all} in some cases e.g.

Wrong use: 
test-unit-sys-prop.test.junit.jar=${nb_all}/libs.junit4/external/junit-4.12.jar

Should be:
test-unit-sys-prop.test.junit.jar=${nb_all}/platform/libs.junit4/external/junit-4.12.jar

This indicate that ${nb_all} is equal to the source root directory of NetBeans and below this directory are the major projects (e.g. enterprise, ide, java, nbbuild).

I search the usage of ${nb_all} and find some exact cases like the one Matthias indicate and some others like:

${nb_all}/javahelp/external/jhall-2.0_05.jar

Should be:
${nb_all}/platform/javahelp/external/jhall-2.0_05.jar

I will execute the unit testing of every module involved in this change and compare them.