qemu: Introduce qemuBuildSgaCommandLine
qemu: Introduce qemuBuildSgaCommandLine

Add new function to manage adding the '-device sga' to the command
line removing that task from the mainline qemuBuildCommandLine

Signed-off-by: John Ferlan <87558058f6f829e5ec976c8ef960720af4ff9c7d@redhat.com>

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