qemu_command: create prefixed alias to separate variable
qemu_command: create prefixed alias to separate variable

Instead of typing the prefix every time we want to append parameters
to qemu command line use a variable that contains prefixed alias.

Signed-off-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>

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