Timeout is too short

[aidanheerdegen]

I've had a few people report issues with getting vdi_jupyter.py working that seem to be resolved by increasing the timeout values here

https://github.com/coecms/nci_scripts/blob/master/vdi_jupyter.py#L168

and here

https://github.com/coecms/nci_scripts/blob/master/vdi_jupyter.py#L238

The current 2 second timeout seems very short.

Proposed fixes:

1. Remove the specified timeout values and just use the default value (10s)
2. Increase the values in each place
3. Make this a user-settable option in cosima_cookbook.conf
4. Some combination of 1-3

This may be related to #13

[ScottWales]

Seems reasonable to increase it to 10 seconds as a first step, if there are still issues after that consider adding configuration.