Some uwsgiconfig.py cleanups

The big thing is using optparse instead of manual options parsing. The limitation of optparse (missing varargs) and the byzantine uwsgi build options (varargs from 0 to n arguments) makes the code not as pretty as i thought but still an improvement. On top of that i've added --verbose switch (based on a patch available in the debian package), --debug and --asan. See last patch for more information about these two.