Add h2 traffic/scenario test

This patch adds a test where we test both h2 and HTTP traffic on the
same load balancer.

For this purpose, we deploy an HTTP listener, a TERMINATED_HTTPS
listener with h2 alpn protocols, and an HTTP pool with h2 alpn protocol
and backend re-encryption.

Change-Id: I470268c91cce18a00baf3fb1f721299bf4662e13
1 file changed