Update CHANGELOG.md for 8.17.1

[ci skip]

CHANGELOG.md

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 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 8.17.1 (2017-02-28)
+
+- Replace setInterval with setTimeout to prevent highly frequent requests. !9271 (Takuya Noguchi)
+- Disable unused tags count cache for Projects, Builds and Runners.
+- Spam check and reCAPTCHA improvements.
+- Allow searching issues for strings containing colons.
+- Disabled tooltip on add issues button in usse boards.
+- Fixed commit search UI.
+- Fix MR changes tab size count when there are over 100 files in the diff.
+- Disable invalid service templates.
+- Use default branch as target_branch when parameter is missing.
+- Upgrade GitLab Pages to v0.3.2.
+- Add performance query regression fix for !9088 affecting #27267.
+- Chat slash commands show labels correctly.
+
 ## 8.17.0 (2017-02-22)
 
 - API: Fix file downloading. !0 (8267)

changelogs/unreleased/27267-events-project-query-performance-regression.yml

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-title: 'Add performance query regression fix for !9088 affecting #27267'
-merge_request:
-author:

changelogs/unreleased/27989-disable-counting-tags.yml

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----
-title: Disable unused tags count cache for Projects, Builds and Runners
-merge_request:
-author:

changelogs/unreleased/28093-snippet-and-issue-spam-check-on-edit.yml

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----
-title: Spam check and reCAPTCHA improvements
-merge_request:
-author:

changelogs/unreleased/28212-avoid-dos-on-build-trace.yml

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----
-title: Replace setInterval with setTimeout to prevent highly frequent requests
-merge_request: 9271
-author: Takuya Noguchi

changelogs/unreleased/28357-colon-search.yml

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----
-title: Allow searching issues for strings containing colons
-merge_request:
-author:

changelogs/unreleased/add-issues-tooltip.yml

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-title: Disabled tooltip on add issues button in usse boards
-merge_request:
-author:

changelogs/unreleased/commit-search-ui-fix.yml

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----
-title: Fixed commit search UI
-merge_request:
-author:

changelogs/unreleased/issue_25112.yml

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----
-title: Disable invalid service templates
-merge_request:
-author:

changelogs/unreleased/issue_28051_2.yml

@@ -1,4 +0,0 @@
----
-title: Use default branch as target_branch when parameter is missing
-merge_request:
-author:

changelogs/unreleased/pages-0-3-2.yml

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----
-title: Upgrade GitLab Pages to v0.3.2
-merge_request:
-author:

changelogs/unreleased/zj-fix-slash-command-labels.yml

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----
-title: Chat slash commands show labels correctly
-merge_request:
-author: