[TUBEMQ-127] Fixed a bug & minor changes

[viviel]

1. Fixed a bug
   Syntax error

map.keySet().iterator(); (1.8 syntax) -> new ArrayList<>(map.keySet()).iterator();

2. Minor changes

if (curToken != null && curToken == usedToken) {
    return true;
}

change to

return curToken != null && curToken == usedToken;

if (isReged == null) {
    return true;
}

change to

return isReged == null;

List<String> partKeys = new ArrayList<>();
partKeys.addAll(partitionUsedMap.keySet());

change to

List<String> partKeys = new ArrayList<>(partitionUsedMap.keySet());

[gosonzhang]

+1