Use simulated time for Envoy server (#14144)
Use simulated time for Envoy server (#14144)

Use simulated time for the integration test to ensure that timers don't
time out due to the test running slow. This prevents test flakes, and
TSAN errors when running in that mode.

Signed-off-by: Alex Konradi <3ee61dd7715e31b012f8edaf69177fdbdc394d59@google.com>
envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,envoyproxy/envoy,lyft/envoy,lyft/envoy,lyft/envoy,envoyproxy/envoy,lyft/envoy