Client properties file should be loaded using commons-configuration

[ctubbsii]

          The code for loading client props seems to use java Properties and not commons config, so FileHandler would not be applicable there.  https://github.com/apache/accumulo/blob/cf42adff3f988ff467ff3f71449732b32703573f/core/src/main/java/org/apache/accumulo/core/clientImpl/ClientInfoImpl.java#L113

Originally posted by @keith-turner in #5233 (comment)

[ibilley7]

I'm interested in working on this ticket. Can you expand on the requirements for this? Do you want the existing method signature to be preserved or should I replace the usage of the Java Properties class in ClientInfoImpl with a commons-configuration equivalent?