add TWISTLOCK_CONSOLE env variable to twistcli

[NGal]

i am not sure if this is the right place to suggest this, but i think it will be really handy to have such an env variable i can set up in my zsh profile file (for example), and not having to write `--address $TWISTLOCK_CONSOLE` every time. similarly to how the cli handles `TWISTLOCK_USER` and `TWISTLOCK_PASSWORD`.

[BPry]

@NGal,

Raising this as a feature request through your SE is probably going to be a better path forward so that it gets entered internally.