Make tmp directory world readable (RHBZ#610880).

Make tmp directory world readable (RHBZ#610880).

If you have a restrictive umask (0077 for example) then
files in the tmp directory would be created with 0600
permissions.  Example:

drwx------.  2 rjones rjones     4096 Jul  2 17:52 .
drwxrwxrwt. 57 root   root     102400 Jul  2 17:52 ..
-rw-------.  1 rjones rjones 86328832 Jul  2 17:52 initrd
lrwxrwxrwx.  1 rjones rjones       46 Jul  2 17:52 kernel -> /boot/vmlinuz-2.6.33-0.40.rc7.git0.fc13.x86_64

This in itself is not a problem.  However in virt-v2v we also
change UID:GID and the result is that qemu is unable to read
the initrd file:

qemu: could not load initial ram disk '/tmp/libguestfs2ssynP/initrd'

With this patch we make the tmp directory and the files
world readable.  After the patch:

$ ls -la /tmp/libguestfsJFVzPg/
total 116192
drwxr-xr-x.  2 rjones rjones      4096 Jul  2 18:03 .
drwxrwxrwt. 56 root   root      102400 Jul  2 18:03 ..
-rw-r--r--.  1 rjones rjones 118869504 Jul  2 18:03 initrd
lrwxrwxrwx.  1 rjones rjones        46 Jul  2 18:03 kernel -> /boot/vmlinuz-2.6.33-0.40.rc7.git0.fc13.x86_64