jpackager --argument arg is broken

This is regression from
http://hg.openjdk.java.net/jdk/sandbox/rev/e094d5483bd6
We changed SplitOptionIntoNameValue() to return true or false based if argument was split or not. It used to be true always.
Parsing code only adds argument if this function returns true, so with change we ignoring all values in config file unless it is in form of A=B.