Update the proxy to linkerd/linkerd2-proxy#3e0e00c

[olix0r]

commit b27dfb2d21aa8ca5466ea0edce17d27094ace7c1
Author: Takanori Ishibashi takanori.1112@gmail.com
Date: Wed May 15 05:58:42 2019 +0900

updaes->updates (#250)

Signed-off-by: Takanori Ishibashi <takanori.1112@gmail.com>

commit 16441c25a9d423a6ab12b689b830d9ae3798fa00
Author: Eliza Weisman eliza@buoyant.io
Date: Tue May 14 14:40:03 2019 -0700

 Pass router::Config directly to router::Layer (#253)

Currently, router `layer`s are constructed with a single argument, a
type implementing `Recognize`. Then, the entire router stack is built
with a `router::Config`. However, in #248, it became necessary to
provide the config up front when constructing the `router::layer`, as
the layer is used in a fallback layer. Rather than providing a separate
type for a preconfigured layer, @olix0r suggested we simply change all
router layers to accept the `Config` when they're constructed (see
https://github.com/linkerd/linkerd2-proxy/pull/248#discussion_r283575008).

This branch changes `router::Layer` to accept the config up front. The
`router::Stack` types `make` function now requires no arguments, and the
implementation of `Service` for `Stack` can be called with any `T` (as
the target is now ignored).

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

commit b70c68d4504a362eac6a7828039a2e5c7fcd308a
Author: Eliza Weisman eliza@buoyant.io
Date: Wed May 15 13:14:04 2019 -0700

Load balancers fall back to ORIG_DST when no endpoints exist (#248)

Currently, when no endpoints exist in the load balancer for a
destination, we fail the request. This is because we expect endpoints to
be discovered by both destination service queries _and_ DNS lookups, so
if there are no endpoints for a destination, it is assumed to not exist.

In linkerd/linkerd2#2661, we intend to remove the DNS lookup from the
proxy and instead fall back to routing requests for which no endpoints
exist in the destination service to their SO_ORIGINAL_DST IP address.
This means that the current approach of failing requests when the load
balancer has no endpoints will no longer work.

This branch introduces a generic `fallback` layer, which composes a
primary and secondary service builder into a new layer. The primary
service can fail requests with an error type that propages the original
request, allowing the fallback middleware to call the fallback service
with the same request. Other errors returned by the primary service are
still propagated upstream.

In contrast to the approach used in #240, this fallback middleware is
generic and not tied directly to a load balancer or a router, and can
be used for other purposes in the future. It relies on the router cache
eviction added in #247 to drain the router when it is not being used,
rather than proactively destroying the router when endpoints are
available for the lb, and re-creating it when they exist again.

A new trait, `HasEndpointStatus`, is added in order to allow the
discovery lookup to communicate the "no endpoints" state to the
balancer. In addition, we add a new `Update::NoEndpoints` variant to
`proxy::resolve::Update`, so that when the control plane sends a no
endpoints update, we switch from the balancer to the no endpoints state
_immediately_, rather than waiting for all the endpoints to be
individually removed. When the balancer has no endpoints, it fails all
requests with a fallback error, so that the fallback middleware

A subsequent PR (#248) will remove the DNS lookups from the discovery
module.

Closes #240.

Signed-off-by: Eliza Weisman <eliza@buoyant.io>

commit 6525b0638ad18e74510f3156269e0613f237e2f5
Author: Zahari Dichev zaharidichev@gmail.com
Date: Wed May 15 23:35:09 2019 +0300

Allow disabling tap by setting an env var (#252)

This PR fixes linkerd/linkerd2#2811. Now if
`LINKERD2_PROXY_TAP_DISABLED` is set, the tap is not served at all. The
approach taken is that  the `ProxyParts` is changed so the
`control_listener` is now an `Option` that will be None if tap is
disabled as this control_listener seems to be exclusively used to serve
the tap. Feel free to suggest a better approach.

Signed-off-by: Zahari Dichev <zaharidichev@gmail.com>

commit 91f32db2ea6d74470fd689c713ff87dc7586222d
Author: Zahari Dichev zaharidichev@gmail.com
Date: Thu May 16 00:45:23 2019 +0300

Assert that outbound TLS works before identity is certified (#251)

This commit introduces TLS capabilities to the support server as well as
tests to ensure that outbound TLS works even when there is no verified
certificate for the proxy yet.

Fixes linkerd/linkerd2#2599

Signed-off-by: Zahari Dichev <zaharidichev@gmail.com>

commit 45aadc6b1b28e6daea0c40e694a86ae518887d85
Author: Sean McArthur sean@buoyant.io
Date: Wed May 15 14:25:39 2019 -0700

Update h2 to v0.1.19

Includes a couple HPACK fixes

Signed-off-by: Sean McArthur <sean@buoyant.io>

commit 3e0e00c6dfbf5a9155b887cfd594f611edfc135f
Author: Oliver Gould ver@buoyant.io
Date: Thu May 16 08:11:06 2019 -0700

Update mio to 0.6.17 (#257)

To pick up https://github.com/tokio-rs/mio/pull/939

[alpeb]

LGTM 👍

[l5d-bot]

Integration test results for 90b12f4: fail 😕
Log output: https://gist.github.com/6b5b436b1644161fe39d3a28a9eca4af

[l5d-bot]

Integration test results for 182f899: success 🎉
Log output: https://gist.github.com/cb02efd9552e885ff61b05bc45498e3c