Bug: inconsistent args

[joewxboy]

CLI Improvements

The command line interfaces for each script are inconsistent and/or incomplete.

• Minor: list-users.sh does not have a help page, while list-orgs.sh does.
• Moderate: list-orgs.sh does not have a complete CLI.
  • It always prompts on terminal for the organization to view users of.

It's important that the scripts can be 100% headless if we want to integrate these into
other scripting.

Functionality

• Major: You need to use a user within an organization to list services, nodes, etc within the org
  • Can't use hubadmin or root to list resources related to non-root org
    • Note: You are able to do this with the Horizon CLI using the --org flag
  • Much of this is related to the CLI improvements above

The test script picks up on the wrong container when checking the health of the mgmt hub:

ℹ Checking for Horizon container...
✓ Horizon container is running
  open_horizon_proxy: Up 8 days

[joewxboy]

These scripts needed --help added:
│ ☐ Add help functionality to list-users.sh
│ ☐ Add help functionality to list-user.sh
│ ☐ Add help functionality to test-credentials.sh
│ ☐ Add help functionality to test-hzn.sh

[joewxboy]

I've successfully modified list-orgs.sh to:

1. Accept -o/--org flag to specify an organization from command line
2. Skip interactive prompt when org is pre-specified
3. Validate the specified org exists in available orgs
4. Updated help documentation with examples

[joewxboy]

Updated test-hzn.sh to look for a container named exchange-api instead of horizon.