[4.7] ADD Force UDP encapsulation option to Site2Site VPNThis PR adds the option to enable forced UDP encapsulation of ESP packets during a setup of a site2site vpn. This options enforces the 'forceencaps' option in the openswan ipsec config:
https://wiki.strongswan.org/projects/strongswan/wiki/ConnSection
* pr/1317:
[UI] MADNESS
[DB] Add force_encap field to s2s_customer_gateway table
[ROUTER] Add forceencaps field to python router ipsec config method
[TEST] unittest needs rework
[MARVIN] Add forceencap field to VpnCustomerGateway class in marvin base
[CORE] Add Force UDP Encapsulation option to Site2Site VPN
Signed-off-by: Remi Bergsma <github@remi.nl>