Improve development workflow in docker (#5079)

* Allow bower install of frontend components as root. Needed for frontend development in docker since everything runs as root in the docker image.

* Improve development workflow in docker

* Use LANG=C.UTF-8 in tox. Fixes installation of libraries with UTF-8 in it's readme.

* Install mysqlclient psycopg2 uvloop after requirements_all.txt again, but with a --no-cache-dir this time. Allows bootstrap_frontend to be executed in a different path like the other scripts.

script/dev_docker

@@ -1,11 +1,15 @@
-# Build and run Home Assinstant in Docker
+#!/bin/sh
+# Build and run Home Assinstant in Docker.
 
 # Optional: pass in a timezone as first argument
 # If not given will attempt to mount /etc/localtime
 
+# Stop on errors
+set -e
+
 cd "$(dirname "$0")/.."
 
-docker build -t home-assistant-dev .
+docker build -t home-assistant-dev -f virtualization/Docker/Dockerfile.dev .
 
 if [ $# -gt 0 ]
 then