Add force flag for local create/up

[SoManyHs]

We want to add a --force flag that will enable customers to always write to the default compose files, without a confirmation prompt if they already exist.

[clareliguori]

And local up? I always want it to overwrite docker-compose.ecs-local.yml when I run ecs-cli local up -f task-def.json, so I'd like to do --force

[SoManyHs]

@clareliguori should we ever force overwrite the overrides compose file?

[clareliguori]

I dont think so, no