Option to hide ec2_client.describe_ actions

[Cloud Cray]

Problem

Boto3 output comes out very noisy if performing an action through a wizard. Most of the generated python script is nothing but ec2_client.describe_ commands.

This is especially noticeable with autocomplete form fields, such as the "add tags" form when launching an EC2 instance - a new ec2_client.describe_tags command is added for each keystroke.

Requested solution

Settings parameter or on-page filter to hide/remove all ec2_client.describe_ actions.

Currently just doing this in a text editor, but would be a very helpful quality-of-life feature.

[Ian Mckay]

Relates to #38.

I'll have another look at this hopefully shortly.

[Cloud Cray]

Looks like a subset of the issues in #38 - will close and pickup discussion there