force rebuild docker environment

When I attempt to force rebuild docker environment described at ansible-docker-initialize.en.md, it didn't seem to do so.

1. I noticed in initialize-docker-environment.py#L85, SEED_FOCE, a typo presumably, should be SEED_FORCE; also, the equality check should be against text '1' instead of number 1 since env variables are treated as text. Suggested change:

   -        if os.environ.get('SEED_FOCE') == 1:
   +        if os.environ.get('SEED_FORCE') == '1':

2. Then I came across errors when the script is running docker stop:

   Traceback (most recent call last):
     File "./initialize-docker-environment.py", line 243, in <module>
       sys.exit(main())
     File "./initialize-docker-environment.py", line 62, in main
       builder.build()
     File "./initialize-docker-environment.py", line 131, in build
       self.build_and_start_containers()
     File "./initialize-docker-environment.py", line 229, in build_and_start_containers
       self.build_container(name, ip)
     File "./initialize-docker-environment.py", line 190, in build_container
       result = subprocess(["docker", "stop", name])
   TypeError: 'module' object is not callable

   Suggested change around initialize-docker-environment.py#L189-L192 is to use subprocess.run instead of subprocess:

                if self.container_is_running(name):
   -                result = subprocess(["docker", "stop", name])
   +                result = subprocess.run(["docker", "stop", name])
                if self.container_is_built(name):
   -                result = subprocess(["docker", "rm", name])
   +                result = subprocess.run(["docker", "rm", name])

Thanks.