Add 2.1.7 release notes

Added 2.1.7 release notes.

Documentation/Release-Notes/MaxScale-2.1.7-Release-Notes.md

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+# MariaDB MaxScale 2.1.7 Release Notes
+
+Release 2.1.7 is a GA release.
+
+This document describes the changes in release 2.1.7, when compared to
+release [2.1.6](MaxScale-2.1.6-Release-Notes.md).
+
+If you are upgrading from release 2.0, please also read the following
+release notes:
+[2.1.6](./MaxScale-2.1.6-Release-Notes.md)
+[2.1.5](./MaxScale-2.1.5-Release-Notes.md)
+[2.1.4](./MaxScale-2.1.4-Release-Notes.md)
+[2.1.3](./MaxScale-2.1.3-Release-Notes.md)
+[2.1.2](./MaxScale-2.1.2-Release-Notes.md)
+[2.1.1](./MaxScale-2.1.1-Release-Notes.md)
+[2.1.0](./MaxScale-2.1.0-Release-Notes.md)
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Changed Features
+
+### Persistent connection statistics
+
+The output of `show servers` now shows the number of times a connection was
+taken from a server's pool as well as the ratio of connections taken from the
+pool versus newly created connections.
+
+## Bug fixes
+
+[Here is a list of bugs fixed in MaxScale 2.1.7.](https://jira.mariadb.org/issues/?jql=project%20%3D%20MXS%20AND%20issuetype%20%3D%20Bug%20AND%20status%20%3D%20Closed%20AND%20fixVersion%20%3D%202.1.7)
+
+* (MXS-1379)[https://jira.mariadb.org/browse/MXS-1379] Undefined outcome on schemarouter query conflict
+* (MXS-1375)[https://jira.mariadb.org/browse/MXS-1375] Reused connections get multiple replies to COM_CHANGE_USER
+* (MXS-1374)[https://jira.mariadb.org/browse/MXS-1374] Persistent connections can't be altered at runtime
+* (MXS-1366)[https://jira.mariadb.org/browse/MXS-1366] Abrupt disconnections with persistent connections
+* (MXS-1365)[https://jira.mariadb.org/browse/MXS-1365] Write to invalid memory in avrorouter
+* (MXS-1363)[https://jira.mariadb.org/browse/MXS-1363] Servers with zero weight aren't used by readconnroute
+* (MXS-1341)[https://jira.mariadb.org/browse/MXS-1341] binlog checksums break avrorouter processing
+
+## Packaging
+
+RPM and Debian packages are provided for the Linux distributions supported
+by MariaDB Enterprise.
+
+Packages can be downloaded [here](https://mariadb.com/resources/downloads).
+
+## 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 maxscale-X.Y.Z.
+
+The source code is available [here](https://github.com/mariadb-corporation/MaxScale).