qemu: Simplify call pattern of qemuBuildDriveURIString
qemu: Simplify call pattern of qemuBuildDriveURIString

Automatically assign secret type from the disk source definition and
pull in adding of the comma. Then update callers to keep generated
output the same.

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