maint: fix comma style issues: python
maint: fix comma style issues: python

Most of our code base uses space after comma but not before;
fix the remaining uses before adding a syntax check.

* python/libvirt-override.c: Consistently use commas.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

elmarco/libvirt,VenkatDatta/libvirt,agx/libvirt,crobinso/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,datto/libvirt,libvirt/libvirt,libvirt/libvirt,zippy2/libvirt,nertpinx/libvirt,shugaoye/libvirt,zippy2/libvirt,taget/libvirt,cbosdo/libvirt,jardasgit/libvirt,cbosdo/libvirt,agx/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,nertpinx/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,olafhering/libvirt,jardasgit/libvirt,elmarco/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,cbosdo/libvirt,eskultety/libvirt,rlaager/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,taget/libvirt,elmarco/libvirt,datto/libvirt,datto/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,shugaoye/libvirt,jfehlig/libvirt,eskultety/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,jardasgit/libvirt,shugaoye/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,zhlcindy/libvirt-1.1.4-maintain,crobinso/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,eskultety/libvirt,agx/libvirt,olafhering/libvirt,jfehlig/libvirt,olafhering/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,taget/libvirt,elmarco/libvirt,taget/libvirt,cbosdo/libvirt,jfehlig/libvirt,agx/libvirt,zippy2/libvirt,zippy2/libvirt,olafhering/libvirt,rlaager/libvirt,rlaager/libvirt,fabianfreyer/libvirt,eskultety/libvirt,shugaoye/libvirt,agx/libvirt,crobinso/libvirt,datto/libvirt,crobinso/libvirt,taget/libvirt,datto/libvirt,elmarco/libvirt,libvirt/libvirt