[PATCH - RFC] unify config parsing

[Michael_E_Brown at Dell.com]

The recent changes to add default.cfg processing bumped the number of
lines in main(). The following patch unifies all config file parsing
into one small loop, removing about a dozen redundant lines of code. It
also removes an unnecessary variable, config_path and uses
options.configdir directly.

This is an RFC because it changes mock behaviour in the following way,
which requres discussion: The "-r" option is no longer required. You
will not get an error message for a missing "-r" option. 

I think this might be useful for the case where somebody sets up their
'default.cfg' to be a full config.

Comments?
--
Michael

 <<mock-cfgunify.patch>> 
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