Add nmap vulscan script

[psyray]

Nmap vulscan script is parsed in the reNgine code but is not installed

rengine/web/reNgine/tasks.py

Line 3186 in a281cf1

if script_id == 'vulscan':

Now it's fixed

Use it in the port_scan config like this

port_scan: {
  'enable_http_crawl': true,
  'timeout': 5,
  # 'exclude_ports': [],
  # 'exclude_subdomains': true,
  'ports': ['top-100'],
  'rate_limit': 150,
  'threads': 30,
  'passive': false,
  # 'use_naabu_config': false,
  'enable_nmap': true,
  # 'nmap_cmd': '',
  'nmap_script': 'vulscan/vulscan.nse,vulners',
  # 'nmap_script_args': ''
}