This commit does the following:
- fully defines the inventory rather than having test-prepare-host.yml
add containers to it
- updates test-prepare-keys.yml to use localhost instead of 127.0.0.1,
uses become_user=jenkins instead of become=false, and removes
redundant connection
- updates test-prepare-host.yml by changing 127.0.0.1 to localhost, and
removes mocking ansible_env
- groups vars in defined in each individual file into a single
test-vars.yml file
Change-Id: I198aab420f5d4c0aa17ef64a05ce300e18d0b108