aurweb dev playbook & fixes for aurweb playbook

aurweb role:

• Make sure that we install gunicorn and uvicorn
• Move python module installation:
  We need some modules to be installed before doing the DB init. (alembic)
• Remove double entry for starting aurweb-git-archive.timer
• Link update wrapper after creating git repo
• Fix permissions for cgit deployment
• Refactor aurweb role variables

root_ssh role:

• Add possibility to add additional ssh root keys

aur-dev.archlinux.org playbook:

• New playbook for aur dev machine(s) ("review apps")
  Goal is to spawn and provision a new VM with aurweb when an MR is created
  See: https://md.archlinux.org/devops-agenda-27-july#

playbooks/aur-dev.archlinux.org.yml

+- name: Setup aur development host
+  hosts: '{{ aurdev_fqdn|default("none") }}'
+  remote_user: root
+  roles:
+    - { role: common, enable_zram_swap: true }
+    - { role: firewalld }
+    - { role: sshd }
+    - { role: root_ssh }
+    - { role: certbot }
+    - { role: nginx }
+    - { role: mariadb, mariadb_innodb_buffer_pool_size: '1G' }
+    - { role: sudo }
+    - { role: redis }
+    - { role: uwsgi }
+    - { role: aurweb, aurweb_domain: "{{ aurdev_fqdn }}", aurweb_environment_type: 'dev' }
+    - { role: fail2ban }
+
+  pre_tasks:
+    - name: Upgrade and reboot
+      include_tasks: tasks/include/upgrade-server.yml