SSH Tunnel support

[aroder]

Description of change

• Added support for SSH tunneling.
• Upgraded to latest version of psycopg2
• Added support for an array for the filter_dbs config property

QA steps

• automated tests passing
• manual qa steps passing (list below): tested by running discover

Risks

Rollback steps

• revert this branch

SSH Tunnel support

The connection is made of SSH Tunnel by adding the following to the config file:

"use_ssh_tunnel": true,
"ssh_jump_server": "",
"ssh_jump_server_port": "",
"ssh_private_key_password": "", <-- this can be blank or left out if no passphrase on the pkey 
"ssh_private_key_path": "",
"ssh_username": ""

Arrays for filter_db property

filter_dbs was a string: "db1, db2, db3"

Now it can alternatively be an array: ["db1", "db2", "db3"]