Makes use simpler. The setools submodules map 1:1 to classes anyway;
the separate modules are simply to ease organization.
Change seinfo to use conditional setter use rather than conditional
instantiation of queries. Note: pylint disable is added because pylint
gets confused by the reuse of the q variable and thinks that q is always
BoolQuery, so it incorrectly reports missing member functions.
Group all exception classes into a module for each package. This is the
first step towards having all exceptions raised by setools libs be a child of
SEToolsException.
Fully compare the lists rather than only counting objects.
Also fix comparison problem in Nodecon and Genfscon. In libqpol, the all
genfscons/nodecons iterators allocate new objects, so the pointer
comparison in PolicySymbol fails.
