Use virBufferTrim when generating boot options
Use virBufferTrim when generating boot options

Instead of tracking the number of added parameters,
add a comma at the end of each one unconditionally
and trim the trailing one at the end.

jfehlig/libvirt,zippy2/libvirt,fabianfreyer/libvirt,datto/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,rlaager/libvirt,eskultety/libvirt,agx/libvirt,datto/libvirt,andreabolognani/libvirt,datto/libvirt,rlaager/libvirt,jfehlig/libvirt,eskultety/libvirt,shugaoye/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,rlaager/libvirt,jardasgit/libvirt,agx/libvirt,jfehlig/libvirt,olafhering/libvirt,libvirt/libvirt,olafhering/libvirt,eskultety/libvirt,VenkatDatta/libvirt,eskultety/libvirt,jardasgit/libvirt,agx/libvirt,olafhering/libvirt,andreabolognani/libvirt,zippy2/libvirt,VenkatDatta/libvirt,taget/libvirt,datto/libvirt,nertpinx/libvirt,crobinso/libvirt,agx/libvirt,fabianfreyer/libvirt,crobinso/libvirt,eskultety/libvirt,libvirt/libvirt,jardasgit/libvirt,nertpinx/libvirt,rlaager/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,olafhering/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,crobinso/libvirt,taget/libvirt,shugaoye/libvirt,andreabolognani/libvirt,jfehlig/libvirt,shugaoye/libvirt,nertpinx/libvirt,taget/libvirt,taget/libvirt,nertpinx/libvirt,libvirt/libvirt,taget/libvirt,zippy2/libvirt,libvirt/libvirt,shugaoye/libvirt,jardasgit/libvirt,datto/libvirt,zippy2/libvirt,fabianfreyer/libvirt,rlaager/libvirt,jardasgit/libvirt,crobinso/libvirt,agx/libvirt,fabianfreyer/libvirt