[FR] add service option to specify deffrent user and password

[yoke88]

if using nmap xml output , ncrack using only one username and password group to test defferent service ,so can we add service options to use defferent username and password group？

for example:
ssh service using username with root,test
rdp servce using username with administrator,admin
mssql service using username with sa,test
and etc