CI: Add ip tunnel to test
Sample run
```
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: Test
::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: [ 17:39:52 ] :: [ LOG ] :: ip tunnel tests
:: [ 17:39:52 ] :: [ BEGIN ] :: Running '/usr/bin/python3 /usr/bin/ip-tunnel-tests.py'
test_add_gre (__main__.IPTunnelTests) ... sit0: ipv6/ip remote any local any ttl 64 nopmtudisc 6rd-prefix 2002::/16
ip_vti0: ip/ip remote any local any ttl inherit nopmtudisc key 0
gre0: gre/ip remote any local any ttl inherit nopmtudisc
tunl0: any/ip remote any local any ttl inherit nopmtudisc
gretun-test: gre/ip remote 10.4.4.4 local 10.3.3.3 dev dummy-test ttl 64
ok
test_add_ipip (__main__.IPTunnelTests) ... sit0: ipv6/ip remote any local any ttl 64 nopmtudisc 6rd-prefix 2002::/16
ip_vti0: ip/ip remote any local any ttl inherit nopmtudisc key 0
gre0: gre/ip remote any local any ttl inherit nopmtudisc
tunl0: any/ip remote any local any ttl inherit nopmtudisc
ipiptun-test: ip/ip remote 10.4.4.4 local 10.3.3.3 dev dummy-test ttl 64
ok
test_add_isatap (__main__.IPTunnelTests) ... sit0: ipv6/ip remote any local any ttl 64 nopmtudisc 6rd-prefix 2002::/16
ip_vti0: ip/ip remote any local any ttl inherit nopmtudisc key 0
gre0: gre/ip remote any local any ttl inherit nopmtudisc
tunl0: any/ip remote any local any ttl inherit nopmtudisc
isatap-test: ipv6/ip remote 10.4.4.4 local 10.3.3.3 dev dummy-test ttl 64 6rd-prefix 2002::/16
ok
test_add_sit (__main__.IPTunnelTests) ... sit0: ipv6/ip remote any local any ttl 64 nopmtudisc 6rd-prefix 2002::/16
ip_vti0: ip/ip remote any local any ttl inherit nopmtudisc key 0
gre0: gre/ip remote any local any ttl inherit nopmtudisc
tunl0: any/ip remote any local any ttl inherit nopmtudisc
sittun-test: ipv6/ip remote 10.4.4.4 local 10.3.3.3 dev dummy-test ttl 64 6rd-prefix 2002::/16
ok
test_add_vti (__main__.IPTunnelTests) ... sit0: ipv6/ip remote any local any ttl 64 nopmtudisc 6rd-prefix 2002::/16
ip_vti0: ip/ip remote any local any ttl inherit nopmtudisc key 0
gre0: gre/ip remote any local any ttl inherit nopmtudisc
tunl0: any/ip remote any local any ttl inherit nopmtudisc
vti-test: ipv6/ip remote 10.4.4.4 local 10.3.3.3 dev dummy-test ttl 64 6rd-prefix 2002::/16
ok
----------------------------------------------------------------------
Ran 5 tests in 0.197s
OK
```