add passreset routes

Introduced `get|post` `/passreset` routes. These routes mimic the
behavior of the existing PHP implementation, with the exception of
HTTP status code returns.

Routes added:
    GET /passreset
    POST /passreset

Routers added:
    aurweb.routers.accounts

* On an unknown user or mismatched resetkey (where resetkey must ==
  user.resetkey), return HTTP status NOT_FOUND (404).
* On another error in the request, return HTTP status BAD_REQUEST (400).

Both `get|post` routes requires that the current user is **not**
authenticated, hence `@auth_required(False, redirect="/")`.

+ Added auth_required decorator to aurweb.auth.
+ Added some more utility to aurweb.models.user.User.
+ Added `partials/error.html` template.
+ Added `passreset.html` template.
+ Added aurweb.db.ConnectionExecutor functor for paramstyle logic.
  Decoupling the executor logic from the database connection logic
  is needed for us to easily use the same logic with a fastapi
  database session, when we need to use aurweb.scripts modules.

At this point, notification configuration is now required to complete
tests involved with notifications properly, like passreset.
`conf/config.dev` has been modified to include [notifications] sendmail,
sender and reply-to overrides. Dockerfile and .gitlab-ci.yml have been
updated to setup /etc/hosts and start postfix before running tests.

* setup.cfg: ignore E741, C901 in aurweb.routers.accounts

These two warnings (shown in the commit) are not dangerous and a bi-product
of maintaining compatibility with our current code flow.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/asgi.py

@@ -1,5 +1,4 @@
 import http
-import os
 
 from fastapi import FastAPI, HTTPException
 from fastapi.responses import HTMLResponse
@@ -11,7 +10,7 @@ import aurweb.config
 
 from aurweb.auth import BasicAuthBackend
 from aurweb.db import get_engine
-from aurweb.routers import auth, html, sso, errors
+from aurweb.routers import accounts, auth, errors, html, sso
 
 routes = set()
 
@@ -43,6 +42,7 @@ async def app_startup():
     app.include_router(sso.router)
     app.include_router(html.router)
     app.include_router(auth.router)
+    app.include_router(accounts.router)
 
     # Initialize the database engine and ORM.
     get_engine()