Add missing context parameter
Merge pull request #353 from bcyrill/cp_patch3

Add missing context parameter
Display a list of ciphers accelerated by a specific engine. Also, skip engines that are listed but unavailable for direct use.
Change order of cpzone check
Merge pull request #355 from bcyrill/cp_patch5

Change order of cpzone check
Add option filter to return_dir_as_array()

- Add a 2nd parameter, default empty, that allows to pass a regex to
  filter files it'll return
- While I'm here, simplify code removinf $canadd var
Fix rrd databases upgrade. Helps ticket #2651

- Replace find that was being called with wrong parameters at
upgrade_054_to_055() and upgrade_080_to_081() by return_dir_as_array()
call.
Move the definition of negate_networks/vpn_networks to its place and re-include ipsec vpns in this tables since scrub for mss clamping need this.
Add header to DHCP and DHCPv6 static mappings tables
is_subnet() will fail here if using comma-separated lists of networks. Use openvpn_validate_cidr() instead.
is_subnet() will fail here if using comma-separated lists of networks. Use openvpn_validate_cidr() instead.
Make check more strong and readble. Also make dhcp6c use its pid file to make things easy
If the interface is not enabled do not try to configure it
Use pid even for hostapd rather then trying to guess with regex
Document local remote network lists in OpenVPN GUI

The local and remote network fields can now have lists of CIDRs, so document this in the GUI.
Document remote network lists in OpenVPN GUI

Also, now the advanced route command is not needed. So change the example to the "remote" command, which can be useful in the advanced box.
Do not do so much work during boot since all interfaces will be called for configuration no need to go and find those. Also delay tracking interfaces during config to give a chance their parents to come up
Do not do double checks for this
Merge pull request #356 from phil-davis/master

Document OpenVPN local and remote network list options
Fix wrong unset calls