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

@@ -20,12 +20,15 @@
       pacman:
         name: archlinux-keyring
         update_cache: yes
-    
+
     - name: Upgrade
       pacman:
         update_cache: yes
         upgrade: yes
 
+    - name: Reboot
+      reboot:
+
   post_tasks:
     - name: Install packages for dummy data generation
       pacman: