bug fix for ipython

[chStaiger]

Previously, there was password prompt and textfield in the jupyter lab when the password needs to be provided.
Now the command shows the prompt 3 times but there is no password field any longer.

It looks like Jupyter lab does not return True for sys.stdin.isatty() any longer.
The first case in interactive_auth which uses getpass can also be triggered by

if sys.stdin.isatty() or 'ipykernel' in sys.modules

Which will open the password prompt in jupyter labs and notebooks.

Tested in jupyter lab, on commandline and in interactive python. I also tested the pipeing of the password to ibridges init.
All works.