sanitytest.py: Do not rely on system libvirt

When running sanitytest.py we should not rely on libvirt library
installed on the system. And since we generate a nice wrapper called
"run" that sets both PYTHON_PATH and LD_LIBRARY_PATH, we should just use
it rather than trying to duplicate it in the Makefile.
(cherry picked from commit 90873ab9)

python/Makefile.am

@@ -122,7 +122,7 @@ $(libvirtmod_lxc_la_OBJECTS): $(LXC_GENERATED)
 EXTRA_DIST += sanitytest.py
 
 check-local:
-	$(AM_V_GEN)PYTHONPATH=$(abs_topbuilddir):$(abs_topbuilddir)/.libs $(PYTHON) $(srcdir)/sanitytest.py
+	$(AM_V_GEN)../run $(PYTHON) $(srcdir)/sanitytest.py
 
 install-data-local:
 	$(mkinstalldirs) $(DESTDIR)$(pyexecdir)