Rename IPv4-only functions to include _ipv4_

Dimitri Papadopoulos Orfanosrequested to merge
DimitriPapadopoulos/vpnc-scripts:_ipv4_ into master

The intent is to clarify the code, more specifically:

  • be consistent with IPv6-only that include _ipv6_ in their name,
  • differentiate from functions operating on both IPv4 and IPv6.

Fixes #55 (closed).

Edited by Dimitri Papadopoulos Orfanos

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