Remove devstack exercises

These seem to be not run for quite some time and they don't
succeed anymore - drop the code to avoid somebody accidentally
running it and wondering. A good example of "if it isn't tested
its broken".

Depends-On: https://review.openstack.org/583146
Depends-On: https://review.openstack.org/583147

Change-Id: I99e8a5ca2925217a5a2401984f3f4f6f032017be
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 7efe4d6..46e50df 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -665,8 +665,7 @@
     enable_service n-cell
 
 Be aware that there are some features currently missing in cells, one
-notable one being security groups.  The exercises have been patched to
-disable functionality not supported by cells.
+notable one being security groups.
 
 Cinder
 ~~~~~~
@@ -729,44 +728,6 @@
 
     ENABLE_IDENTITY_V2=False
 
-Exercises
-~~~~~~~~~
-
-``exerciserc`` is used to configure settings for the exercise scripts.
-The values shown below are the default values. These can all be
-overridden by setting them in the ``localrc`` section.
-
-* Max time to wait while vm goes from build to active state
-
-    ::
-
-        ACTIVE_TIMEOUT==30
-
-* Max time to wait for proper IP association and dis-association.
-
-    ::
-
-        ASSOCIATE_TIMEOUT=15
-
-* Max time till the vm is bootable
-
-    ::
-
-        BOOT_TIMEOUT=30
-
-* Max time from run instance command until it is running
-
-    ::
-
-        RUNNING_TIMEOUT=$(($BOOT_TIMEOUT + $ACTIVE_TIMEOUT))
-
-* Max time to wait for a vm to terminate
-
-    ::
-
-        TERMINATE_TIMEOUT=30
-
-
 .. _arch-configuration:
 
 Architectures
diff --git a/doc/source/guides/single-machine.rst b/doc/source/guides/single-machine.rst
index 48a4fa8..515ea9a 100644
--- a/doc/source/guides/single-machine.rst
+++ b/doc/source/guides/single-machine.rst
@@ -127,7 +127,3 @@
 http://192.168.1.201/ for the dashboard (aka Horizon). Launch VMs and if
 you give them floating IPs and security group access those VMs will be
 accessible from other machines on your network.
-
-Some examples of using the OpenStack command-line clients ``nova`` and
-``glance`` are in the shakedown scripts in ``devstack/exercises``.
-``exercise.sh`` will run all of those scripts and report on the results.
diff --git a/doc/source/overview.rst b/doc/source/overview.rst
index 814a2b1..2479cd0 100644
--- a/doc/source/overview.rst
+++ b/doc/source/overview.rst
@@ -75,11 +75,3 @@
 
 -  single node
 -  multi-node configurations as are tested by the gate
-
-Exercises
----------
-
-The DevStack exercise scripts are no longer used as integration and gate
-testing as that job has transitioned to Tempest. They are still
-maintained as a demonstrations of using OpenStack from the command line
-and for quick operational testing.