Replace manual array copy to utility method call
------------------------------------------------

                 Key: GIRAPH-175
                 URL: https://issues.apache.org/jira/browse/GIRAPH-175
             Project: Giraph
          Issue Type: Improvement
            Reporter: Jakob Homan
            Priority: Trivial


{code}      String[] zkJavaOptsArray = zkJavaOptsString.split(" ");
      if (zkJavaOptsArray != null) {
        for (String javaOpt : zkJavaOptsArray) {
          commandList.add(javaOpt);
        }
      }{code}
Rather than doing the loop ourselves, Collections.addAll would be simpler (and 
faster, though that doesn't matter with such a small array).  Still cleaner, 
though.

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