adding credentials CLI commands for nas,vs,server

1. ADDED 
> sl nas credentials 587**
:...........:............:
:  username :  password  :
:...........:............:
: SL1319** : *** :
:...........:............:


2. remove passwords and username info from sl nas list 
3. Added 
 > sl vs  credentials d09e0fcc-e03c-4c48-9447-****
:..........:..........:
: username : password :
:..........:..........:
:   root   : ***** :
:..........:..........:


4. Added 

sl server credentials 7f47544b-ffff-4ee7-a9b8-******
:..........:..........:
: username : password :
:..........:..........:
:   root   : ***** :
:..........:..........:

5. leaving credentials in details CLI (va, server) 
6. the server details --password display was nto consistent. made it consistent with VS 
:              users : :..........:..........:              :
:                    : : username : password :              :
:                    : :..........:..........:              :
:                    : :   root   : ***** :              :
:                    : :..........:..........:  



8. changed the test to match the change

Why add a new line?