add subnet mask to interface address

[realies]

fixes #330

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[thespad]

An immediate concern I can see with this is that applying it to an existing install would result in duplicate IP addresses being allocated as f/ex 10.10.13.2/32 would not exist in any current peer conf and would therefore be acceptable to assign to a new peer, even if there was already one with 10.10.13.2 allocated.

[realies]

@thespad, is something like this going to be better? If not, do you have any suggestions?

Suggested change

	PROPOSED_IP="${INTERFACE}.${idx}/32"
	if ! grep -q -R "${PROPOSED_IP}" /config/peer*/*.conf 2>/dev/null && ([[ -z "${ORIG_INTERFACE}" ]] || ! grep -q -R "${ORIG_INTERFACE}.${idx}/32" /config/peer*/*.conf 2>/dev/null); then
	for idx in {2..254}; do
	PROPOSED_IP="${INTERFACE}.${idx}/32"
	if ! grep -q -R "${INTERFACE}.${idx}" /config/peer*/*.conf 2>/dev/null &&
	! grep -q -R "${INTERFACE}.${idx}/32" /config/peer*/*.conf 2>/dev/null &&
	([[ -z "${ORIG_INTERFACE}" ]] ||
	(! grep -q -R "${ORIG_INTERFACE}.${idx}" /config/peer*/*.conf 2>/dev/null &&
	! grep -q -R "${ORIG_INTERFACE}.${idx}/32" /config/peer*/*.conf 2>/dev/null)); then
	CLIENT_IP="${PROPOSED_IP}"
	break
	fi
	done

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