add privileged for auxiliary scan and discovery

[JLT032]

Summary

while privileged is available with db_nmap it is not with other modules

only requirement is to set capabilities for nmap on the system as documented here https://secwiki.org/w/Running_nmap_as_an_unprivileged_user#Set_capabilities

afaik no use of auxiliary for scanning and discovery has the privileged flag available

Basic example

use auxiliary/scanner/portscan/syn info

does not show the ability to have PRIVILEGED as a flag to set so the backend uses --priviileged

Motivation

use of --privileged would enable for use of metasploit without requirement to switch to root