Updates][major_versions].

This release obsoletes OkHttp 2.x, and all code that uses OkHttp's
`com.squareup.okhttp` package should upgrade to the `okhttp3` package. Libraries
that depend on OkHttp should upgrade quickly to prevent applications from being
stuck on the old version.

 *  **There is no longer a global singleton connection pool.** In OkHttp 2.x,

        * Then upgrade nodes to Kubernetes v1.3.
            * As nodes are upgraded, they will automatically, by default, opt-in to attach/detach controller management, which will cause the controller to start managing attaches/detaches for volumes that get scheduled to those nodes.

    call2.execute().use { response ->
      assertThat(
        response.body.string(),
      ).isEqualTo("b")
    }

    // Calls succeed after the degraded pong timeout because the degraded pong was received.
    Thread.sleep(TimeUnit.NANOSECONDS.toMillis(Http2Connection.DEGRADED_PONG_TIMEOUT_NS.toLong()))
    val call3 = client.newCall(Request(server.url("/")))

    peer.sendFrame().data(false, 3, Buffer().writeUtf8("abc"), 3)
    peer.acceptFrame() // RST_STREAM
    peer.acceptFrame() // DEGRADED PING
    peer.acceptFrame() // AWAIT PING
    peer.sendFrame().ping(true, Http2Connection.DEGRADED_PING, 1) // DEGRADED PONG
    peer.sendFrame().ping(true, Http2Connection.AWAIT_PING, 0) // AWAIT PONG
    peer.play()

    // Play it back.

online.help.name.scheduler=scheduler
# Online help key for crawling info.
online.help.name.crawlinginfo=crawlinginfo
# Online help key for backup.
online.help.name.backup=backup
# Online help key for upgrade.
online.help.name.upgrade=upgrade
# Online help key for search request.
online.help.name.sereq=sereq
# Online help key for access token.
online.help.name.accesstoken=accesstoken
# Online help key for suggest.