1.1.17 release notes and final EOL announcement (#5169)

* 1.1.17 release notes

* Fix date and remove unnecessary alias.

* Update 1.1.17 publish date and add alias.

content/en/news/2019/announcing-1.1-eol-final/index.md

@@ -0,0 +1,13 @@
+---
+title: Support for Istio 1.1 has ended
+description: Istio 1.1 end of life announcement.
+publishdate: 2019-10-21
+attribution: The Istio Team
+aliases:
+---
+
+As [previously announced](/news/2019/announcing-1.1-eol/), support for Istio 1.1 has now officially ended.
+
+Since we learned of the security vulnerability [behind our October 8th security release](/news/2019/istio-security-2019-005) while still barely within the 1.1 support period, we decided to extend the 1.1 support period beyond the original announcement and release [1.1.16](/news/2019/announcing-1.1.16).   Then we discovered a [bug in HTTP header size calculation](https://github.com/istio/istio/issues/17735) was introduced by the security release, so we decided to release a fix in one last [1.1.17](/news/2019/announcing-1.1.17) release before closing out the 1.1 series for good.
+
+At this point we will no longer back-port fixes for security issues and critical bugs to 1.1, so we heartily encourage you to upgrade to the latest version of Istio ({{<istio_release_name>}}) if you haven't already.

content/en/news/2019/announcing-1.1.17/index.md

@@ -0,0 +1,18 @@
+---
+title: Announcing Istio 1.1.17
+description: Istio 1.1.17 patch release.
+publishdate: 2019-10-21
+attribution: The Istio Team
+release: 1.1.17
+aliases:
+    - /news/announcing-1.1.7
+---
+
+We're pleased to announce the availability of Istio 1.1.17.  This will be the last 1.1.x patch release.  Please see below for what's changed.
+
+{{< relnote >}}
+
+## Bug fixes
+
+- Fix a bug introduced by [our October 8th security release](/news/2019/istio-security-2019-005) which incorrectly calculated HTTP header and body sizes ([Issue 17735](https://github.com/istio/istio/issues/17735).
+