Add logging support to udiRoot

[dmjacobsen]

From Doug on 2015-12-11

""" The udiRoot component should log usage and errors to common log interfaces based on configuration in udiRoot.conf Ideally the logging support should use local stdout/stderr, syslog, or the console log (explicitly for Cray systems) depending on config. Basic usage information (such as what is captured in /var/shifterConfig.json) should be logged as well as any errors that occur. """