iproute2: 4.5.0 -> 4.7.0 (#18435)

iproute now packages a bash-completion file which it installs to
$BASH_COMPDIR.

* fanpatch: adjust for new version

- The patch did not apply because the code around the additions changed.
- The patch uses functions that got changed [1] & [2], I adjusted the
  patch to use the safe version. Probably not needed but better safe
  than sorry.
[1] format_host: http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?id=a418e451643e77fe36861e53359587ba8aa41873
[2] rt_addr_n2a: http://git.kernel.org/cgit/linux/kernel/git/shemminger/iproute2.git/commit/?id=7faf1588a755edb9c9cabbe1d3211265e9826d28