Stop command needs more user feedback when incorrectly used

[jeffmcjunkin]

Issue Template

Context

Please provide any relevant information about your setup. This is important in case the issue is not reproducible except for under certain conditions.

jeff@blue:~/dev/SILENTTRINITY$ git branch
* master
jeff@blue:~/dev/SILENTTRINITY$ git rev-parse HEAD
c3b397d85dbb471c4f202151d30100e4222215eb

• SILENTTRINITY Version: Latest master branch
• OS running the Client: Ubuntu 18.04 x64
• Python Version Running the Client: Python 3.7.4+
• OS running the TeamServer: Ubuntu 18.04 x64 (same system as client)
• Python version running the Teamserver: Python 3.7.4 (same system as client)

Expected Behavior

The stop command from within the listeners context should stop the listener.

Current Behavior

Currently I wasn't able to stop a listener other than restarting teamserver.py

Failure Information

[1] ST ≫ listeners                                                                                                                                                                                                 
[1] ST (listeners) ≫ use http                                                                                                                                                                                      
[1] ST (listeners)(http) ≫ set Port 8000                                                                                                                                                                           
[1] ST (listeners)(http) ≫ list                                                                                                                                                                                    
[1] ST (listeners)(http) ≫ start                                                                                                                                                                                   
[1] ST (listeners)(http) ≫ list                                                                                                                                                                                    
┌Running────────────────────────────┐
│ Name │ URL                        │
├──────┼────────────────────────────┤
│ http │ http://10.153.143.148:8000 │
└──────┴────────────────────────────┘
[1] ST (listeners)(http) ≫ stop                                                                                                                                                                                    
[1] ST (listeners)(http) ≫ list                                                                                                                                                                                    
┌Running────────────────────────────┐
│ Name │ URL                        │
├──────┼────────────────────────────┤
│ http │ http://10.153.143.148:8000 │
└──────┴────────────────────────────┘
[1] ST (listeners)(http) ≫  

A separate terminal window shows python3 is still listening:

jeff@blue:~/dev/SILENTTRINITY$ lsof -ni | grep :8000
python3 12973 jeff   23u  IPv4 131287      0t0  TCP 10.153.143.148:8000 (LISTEN)

Steps to Reproduce

Start to finish is shown under Failure Information

Failure Logs

I can provide more information if needed, but I think the above is enough to replicate this from scratch.

[jeffmcjunkin]

Derp! I needed more judicious use of -h:

[1] ST (listeners)(http) ≫ list                                                                                                                                                                                    
┌Running───────────────────────────┐
│ Name │ URL                       │
├──────┼───────────────────────────┤
│ http │ http://192.168.252.1:8000 │
└──────┴───────────────────────────┘
[1] ST (listeners)(http) ≫ stop                                                                                                                                                                                    
[1] ST (listeners)(http) ≫ stop http                                                                                                                                                                               
[1] ST (listeners)(http) ≫ list   

Maybe an incomplete command like stop by itself should give an error or show the usage, instead?