Merge pull request emissary-ingress#757 from datawire/rhs/0.39.0

Ambassador 0.39.0 release

Merge pull request emissary-ingress#755 from datawire/concaf/tests/00…

…1-simple-statsd

enable statsd for 001-simple

Merge pull request emissary-ingress#754 from datawire/concaf/tests/in…

…crease-sleep-time

increase sleep times in tests

Merge pull request emissary-ingress#751 from datawire/concaf/fix/remo…

…ve-statsd-reference

Remove statsd reference from template

Merge pull request emissary-ingress#724 from tech-sketch/tech-sketch/…

…feature/bypass_ProtocolError

catch urllib3.exceptions.ProtocolError and continue watching

Drop default statsd container

Till now, Ambassador's deployment consisted of 2 containers, one
ambassador container and another statsd container. This commit
removes the statsd container and instead allows exposing
statistics over StatsD using `STATSD_ENABLED: true` environment
variable. Basically, the functionality of statsd sidecar container
has been baked into the ambassdor container. Why?
- The statsd container was essentially just one `socat` command.
  That's a lot of overhead for just one command.
- An extra statsd container by default used to add confusion for
  the end-user who did not have a `statsd-sink` service configured
  because it used to continuously blurt logs complanining about
  the same. Now, users need to be explicit about starting `socat`.

Also, now `socat` is only fired when `statsd-sink` name is
resolvable by the DNS. This is checked every 4 seconds if
`STATSD_ENABLED: true` is set. The DNS is no longer constantly
polled by `socat`.

Fix emissary-ingress#568

Merge pull request emissary-ingress#715 from datawire/concaf/release/…

…0.38.0

Ambassador 0.38.0 release

Merge pull request emissary-ingress#715 from datawire/concaf/release/…

…0.38.0

Ambassador 0.38.0 release

Merge pull request emissary-ingress#712 from datawire/concaf/docs/e2e…

…-docs

Refactor end-to-end README.md

Try adding sleep before starting ambassador