[CDF-289][REGRESSION] CDF is breaking at runtime in biserver 4.x due to ...

...unknown method call FilenameUtils.normalize( filename, unixSeparator )

	- upgrade of CDF's commons-io ivy dependency from 1.4 to 2.1 solves compile time errors, but in runtime the 4.8 platform still uses it's own ivy dependency of 1.4
	- https://commons.apache.org/proper/commons-io/javadocs/api-2.1/org/apache/commons/io/FilenameUtils.html#normalize(java.lang.String,%20boolean) is from commons-io 2.1 and above;
	- https://commons.apache.org/proper/commons-io/javadocs/api-1.4/org/apache/commons/io/FilenameUtils.html#normalize(java.lang.String) is the one to call for commons-io 1.4;