Significant cleanup of wording around lava-test-shell
Significant cleanup of wording around lava-test-shell

Fix up English
Add lots of code-block:: yaml directives
s/refactoring/pipeline/

Change-Id: Ieb5b2d2a0ed9905f135e3f090b16e39773dce6d0

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server