Update 2.2 change log and add 2.2.9 release notes

Documentation/Release-Notes/MaxScale-2.2.9-Release-Notes.md

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+# MariaDB MaxScale 2.2.9 Release Notes -- 2018-06
+
+Release 2.2.9 is a GA release.
+
+This document describes the changes in release 2.2.9, when compared to
+release 2.2.7 (2.2.8 was not officially released).
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Bug fixes
+
+### 2.2.9
+* [MXS-1899](https://jira.mariadb.org/browse/MXS-1899) generated [maxscale] section causes errors
+* [MXS-1896](https://jira.mariadb.org/browse/MXS-1896) LOAD DATA INFILE is mistaken for LOAD DATA LOCAL INFILE
+* [MXS-1743](https://jira.mariadb.org/browse/MXS-1743) Maxscale unable to enforce round-robin between read service for Slave
+
+### 2.2.8
+* [MXS-1889](https://jira.mariadb.org/browse/MXS-1889) A single remaining master is valid for readconnroute configured with 'router_options=slave'
+* [MXS-1740](https://jira.mariadb.org/browse/MXS-1740) Hintfilter leaks memory
+
+## Known Issues and Limitations
+
+There are some limitations and known issues within this version of MaxScale.
+For more information, please refer to the [Limitations](../About/Limitations.md) document.
+
+## Packaging
+
+RPM and Debian packages are provided for the Linux distributions supported
+by MariaDB Enterprise.
+
+Packages can be downloaded [here](https://mariadb.com/downloads/mariadb-tx/maxscale).
+
+## Source Code
+
+The source code of MaxScale is tagged at GitHub with a tag, which is identical
+with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
+is X.Y.Z. Further, *master* always refers to the latest released non-beta version.
+
+The source code is available [here](https://github.com/mariadb-corporation/MaxScale).