Command check status object. This is an abstract object that we use in to report results from a check of various kinds.

The purpose of this object is to consolidate the code for certain kinds of command checks into a single routine that can be used for different purposes - verification, selection from multiple possibilities (such as multiple paths), and command action processing. This object encapsulates a status - success or failure - and, when the status is failure, a message giving the reason for the failure.

class CheckStatus :   object