[master] remove some python optimized byte-compiled files

msgq_run_test.py uses src/lib/python/isc/cc/proto_defs.py which
uses cc_generated version which created some .pyo files:
./src/lib/python/isc/cc/cc_generated/__init__.pyo
./src/lib/python/isc/cc/cc_generated/proto_defs.pyo
which are left over after distclean.

quick review via jabber

src/lib/python/isc/cc/cc_generated/Makefile.am

@@ -26,6 +26,7 @@ CLEANDIRS = __pycache__
 
 CLEANFILES = proto_defs.py __init__.py
 CLEANFILES += proto_defs.pyc __init__.pyc
+CLEANFILES += proto_defs.pyo __init__.pyo
 
 clean-local:
 	rm -rf $(CLEANDIRS)