Switch from IBM classes to JDK 8 Classes

[chiragsanghavi]

This should be updated to switch to use JDK 8 in place of IBM classes.

https://github.com/SoftwareAG/WxMonitoring/blob/d6bd93a008a42fc5aabfc780c838380cb80f6bfc/assets/IS/Packages/WxMonitoring/code/source/wx/monitoring/impl/file.java#L23