Eliminate deprecated route cache flushing

Dimitri Papadopoulos Orfanosrequested to merge
DimitriPapadopoulos/vpnc-scripts:sledge.ez-master-patch-14501 into master

Just reworking !30 (closed) from @sledge.ez:

  • after applying !54 (merged), which took care of mixed IPv4/IPv6 cases and removed some IPv4 cases,
  • after discarding all pure IPv6 cases,
  • one single IPv4 case has fallen through the cracks and needs to be removed.

NOTES Starting with Linux kernel version 3.6, there is no routing cache for IPv4 anymore. Hence ip route show cached will never print any entries on systems with this or newer kernel versions.

Additionally see:
https://man7.org/linux/man-pages/man8/ip-route.8.html
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=89aef8921bfbac22f00e04f8450f6e447db13e42
https://lwn.net/Articles/507852/

Edited by Dimitri Papadopoulos Orfanos

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