8.1b1

• Accept hostname down to 1 char long.
• Fix PGDATA always empty in CSV inventory.
• Fix missing schema in upgrade script.
• Export comment in CSV inventory.
• Unquote PGDATA from CSV inventory.
• Debian package now use system psycopg2.
• Add user-agent in about page.
• Internalize deps without virtualenv on UI debian package.
• No longer displays UNDEF items in the UI
• Fix logging on light terminal.
• Improve errors displayed in the agent log
• Remove stretch from packages and CI
• Fix monitoring probe when the OS release includes a + sign.
• Pin minor version of Python dependency in debian packages.
• Auto reconnect PostgreSQL on connection lost in statements and maintenance
  agent endpoints.
• UI: Check DB connectivity only for serve and web command.