make lineIterator() prototype unambiguous

fixing
[javac] /builddir/build/BUILD/spacewalk-java-2.3.14/code/src/com/redhat/rhn/common/util/FileUtils.java:175: error: reference to lineIterator is ambiguous, both method lineIterator(InputStream,Charset) in IOUtils and method lineIterator(InputStream,String) in IOUtils match
    [javac]             LineIterator it = org.apache.commons.io.IOUtils.lineIterator(fileStream, null);
    [javac]                                                            ^
disable reporting cyclic imports
Automatic commit of package [spacewalk-java] release [2.3.16-1].