Modify test for combo4 to also check that the set attribute does not
override the variable set in installData.
Merge pull request #265 from mtjandra/IZPACK-1154

[IZPACK-1154] - Fix for set attribute of Combo fields and Tests
[IZPACK-1155] - VariableCondition is missing replace-call
Merge pull request #266 from rkrell/IZPACK-1155

[IZPACK-1155] - VariableCondition is missing replace-call
Merge remote-tracking branch 'upstream/master'