OpenConnect VPN for OS12#294

WIll be really usefull to have OpenConnect VPN options for IGEL OS12.

This will allow users to configure these VPN protocols:

• Cisco AnyConnect (–protocol=anyconnect)
• Array Networks AG SSL VPN (–protocol=array)
• Juniper SSL VPN (–protocol=nc)
• Pulse Connect Secure (–protocol=pulse)
• Palo Alto Networks GlobalProtect SSL VPN (–protocol=gp)
• F5 Big-IP SSL VPN (–protocol=f5)
• Fortinet Fortigate SSL VPN (–protocol=fortinet)