qemuDomainCreateDevice: Be more careful about device path
qemuDomainCreateDevice: Be more careful about device path

Again, not something that I'd hit, but there is a chance in
theory that this might bite us. Currently the way we decide
whether or not to create /dev entry for a device is by marching
first four characters of path with "/dev". This might be not
enough. Just imagine somebody has a disk image stored under
"/devil/path/to/disk". We ought to be matching against "/dev/".

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

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