tests: import benchmark reproduction setup playbook

Incomplete, also needs to mess around with Gcloud routing and handle box
setup/teardown, because that's another "well engineered" waste of time.

tests/ansible/gcloud/README.md

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+
+# Command line.
+
+````
+time LANG=C LC_ALL=C ANSIBLE_STRATEGY=mitogen MITOGEN_GCLOUD_GROUP=debops_all_hosts debops common
+```

tests/ansible/gcloud/ansible.cfg

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+[defaults]
+inventory = hosts
+retry_files_enabled = False

tests/ansible/gcloud/controller.yml

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+
+- hosts: controller
+  tasks:
+    - shell: "rsync -a ~/.ssh {{inventory_hostname}}:"
+      connection: local
+
+    - lineinfile:
+        line: "net.ipv4.ip_forward=1"
+        path: /etc/sysctl.conf
+      register: sysctl_conf
+      become: true
+
+    - shell: /sbin/sysctl -p
+      when: sysctl_conf.changed
+      become: true
+
+    - shell: |
+        iptables -t nat -F;
+        iptables -t nat -X;
+        iptables -t nat -A POSTROUTING -j MASQUERADE;
+      become: true
+
+    - apt: name={{item}} state=installed
+      become: true
+      with_items:
+      - python-pip
+      - python-virtualenv
+      - strace
+      - libldap2-dev
+      - libsasl2-dev
+      - build-essential
+      - git
+
+    - git:
+        dest: ~/mitogen
+        repo: https://github.com/dw/mitogen.git
+        version: dmw
+
+    - git:
+        dest: ~/ansible
+        repo: https://github.com/dw/ansible.git
+        version: lazy-vars
+
+    - pip:
+        virtualenv: ~/venv
+        requirements: ~/mitogen/dev_requirements.txt
+
+    - pip:
+        virtualenv: ~/venv
+        editable: true
+        name: ~/mitogen
+
+    - pip:
+        virtualenv: ~/venv
+        editable: true
+        name: ~/ansible
+
+    - lineinfile:
+        line: "source $HOME/venv/bin/activate"
+        path: ~/.profile
+
+    - name: debops-init
+      shell: ~/venv/bin/debops-init ~/prj
+      args:
+        creates: ~/prj
+
+    - name: grpvars
+      copy:
+        dest: "{{ansible_user_dir}}/prj/ansible/inventory/group_vars/all/dhparam.yml"
+        content: |
+          ---
+          dhparam__bits: [ '256' ]
+
+    - blockinfile:
+        path: ~/prj/.debops.cfg
+        insertafter: '\[ansible defaults\]'
+        block: |
+          strategy_plugins = {{ansible_user_dir}}/mitogen/ansible_mitogen/plugins/strategy
+          forks = 50
+          host_key_checking = False
+
+    - file:
+        path: ~/prj/ansible/inventory/gcloud.py
+        state: link
+        src: ~/mitogen/tests/ansible/lib/inventory/gcloud.py
+

tests/ansible/gcloud/hosts

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+[controller]
+35.206.145.240