virsh-domain: Fix declarations of flag variables in cmdChangeMedia
virsh-domain: Fix declarations of flag variables in cmdChangeMedia

The parameter options can be declared directly.

Also use macros for mutual exclusion on some of the incompatible
parameter variables.

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