Remove the key.password option

[lennylessizmor]

Passing account keyfile passwords as command line options is poor security practice. And while it is true that a user can avoid this by storing the pwd in an environment variable (eg key.password=$(ORACLE_PWD)), the readme and --help document the poor practice of passing plain text pwds on the command line.

I recommend removing key.password and have the autoracle look for the password in a specific environment variable. If no such variable is found, prompt user for the pwd at runtime (using a terminal library that doesn't echo the user input).

[Jason-Zhangxin-Chen]

@lennylessizmor Thank you so much for this idea, that is valid for the UE improvement. I will plan to have it.