Fix checking DHCP end IP is in range

Cut-paste bug
Merge pull request #861 from phil-davis/master

Fix checking DHCP end IP is in range
Check that DHCP end IP is >= DHCP start IP
Fix whitespaces and indent
tidy up html
Use correct vars for IPv6 when checking subnet start and end
Fix vpn_pppoe_get_id and stop duplicating pppoeid for multiple servers, it fixes #2286
Merge pull request #862 from phil-davis/master

Fixes for DHCP range validation when entering from console
Use current racoon.conf syntax to avoid issues when deprecated one is removed, it fixes #3338