feat(scan): support external port scanner(nmap) in host machine (#1207)

* feat(scan): load portscan settings from config.toml

* feat(scan): support external port scanner:nmap

* style: rename variable

* feat(scan): logging apply options

* feat(scan): remove spoof ip address option

* feat(scan): more validate port scan config

* style: change comment

* fix: parse port number as uint16

* feat(discover): add portscan section

* feat(discover): change default scanTechniques

* feat(docker): add nmap and version update

* feat(scan): nmap module upgrade

* fix: wrap err using %w

* feat(scan): print cmd using external port scanner

* feat(scan): more details external port scan command

* feat(scan): add capability check in validation

* fix(scanner): format error

* chore: change format

subcmds/discover.go

@@ -219,6 +219,12 @@ host                = "{{$ip}}"
 #osUser = "wordpress"
 #docRoot = "/path/to/DocumentRoot/"
 
+#[servers.{{index $names $i}}.portscan]
+#scannerBinPath = "/usr/bin/nmap"
+#hasPrivileged = true
+#scanTechniques = ["sS"]
+#sourcePort = "65535"
+
 #[servers.{{index $names $i}}.optional]
 #key = "value1"