make tests more flexible

docs/testing.md

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+# Automated Testing
+
+This section describes how to use the automated testing facilities.
+You don't have to do this as an end user.
+
+They test the following aspects:
+ - System functions (communication interfaces, configuration storage)
+ - Functionality of the motor controller and state machine
+ - High speed and high load conditions
+
+The testing facility consists of the following components:
+ * **Test rig:** In the simplest case this can be a single ODrive with a single motor and encoder pair. Can also be multiple ODrives with multiple axes, some of which may be mechanically coupled.
+ * **Test host:** The PC on which the test script runs. All ODrives must be connected to the test host via USB.
+ * **test-rig.yaml:** Describes your test rig. Make sure all values are correct. Incorrect values may physically break or fry your test setup.
+ * **run_tests.py:** This is the main script that runs all the tests.
+
+## How to run
+
+Example:
+
+```
+./run_tests.py --skip-boring-tests --ignore top-odrive.yellow bottom-odrive.yellow
+```