CLI should exit with non-zero return code when failed.

[the729]

The current behavior of cm-cli.py is to log error and continue, when it encounters any error during installation of custom nodes, i.e. git clone failed or pip install failed.

This behaviour is not optimal for using in docker build, as the container builder will think it has succeeded.

Can we add a flag to make it abort installation if any errors happened?

[ltdrdata]

Ok. I'll add it.