Deprecate session specific log priorities

They are not particularly useful, they surely are not used
and impose a small cost for every event extracted from the
poll sets.

This commit only removes the maxadmin commands, subsequent
commits will remove the actual code.

Documentation/Release-Notes/MaxScale-2.2.0-Release-Notes.md

@@ -0,0 +1,59 @@
+# MariaDB MaxScale 2.2.0 Release Notes
+
+Release 2.2.0 is a Beta release.
+
+This document describes the changes in release 2.2.0, when compared to
+release 2.1.X.
+
+For any problems you encounter, please consider submitting a bug
+report at [Jira](https://jira.mariadb.org).
+
+## Changed Features
+
+### Blah
+
+## Dropped Features
+
+### MaxAdmin
+
+The following deprecated commands have been removed:
+
+* `enable log [debug|trace|message]`
+* `disable log [debug|trace|message]`
+* `enable sessionlog [debug|trace|message]`
+* `disable sessionlog [debug|trace|message]`
+
+The following commands have been deprecated:
+
+* `enable sessionlog-priority <session-id> [debug|info|notice|warning]`
+* `disable sessionlog-priority <session-id> [debug|info|notice|warning]`
+
+The commands can be issued, but have no effect.
+
+## New Features
+
+### Blah
+
+## Bug fixes
+
+[Here is a list of bugs fixed since the release of MaxScale 2.1.X.]()
+
+## 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/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 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).