Cloud Migration: Create command line tool to administer PAGER system

[mhearne-usgs]

This tool should run on PAGER group desktops, and authenticate using ssh keys as is done for access to on-prem systems. This tool should allow users to:

• re-run events
• stop/un-stop events
• retrieve PAGER outputs (hopefully from database, maybe also from S3) - model results, exposures
• retrieve user information (encrypt using requestor's public key?)
• modify inputs like: landscan grid, country code grid, empirical loss parameters, etc.
• update PAGER source code
• update PAGER compute container (AMI, Docker container, etc.)
• Control user database: add, delete, modify (add profiles, change email, thresholds)
• Upload HAZUS input (lots of questions about how we are going to integrate HAZUS into real-time)
• Add famous cities to database (see Cloud Migration: Famous Cities #279 )