qemu: Use dynamic buffer for storing PTY aliases
qemu: Use dynamic buffer for storing PTY aliases

https://bugzilla.redhat.com/show_bug.cgi?id=1560976

For historical reasons we've used 32 bytes long static buffer for
storing PTY aliases. This breaks users scenario where they try to
start a machine with user alias consisting of "ua-$uuid".

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>

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