We now pass a pointer to the context where necessary. There are a
few cases where we need to request the context from sudoers via
sudoers_get_context() for the plugin API functions. If the plugin
API was able to pass around a closure pointer this would not be
necessary.
The output of "sudo -ll command" consists of the matching sudoers
rule (in long form) with the addition of a "Matched" entry that
shows the fully-qualfied path along with any arguments.
