Add nmap type information (#4292)

Author: Philipp Hahn <hahn@univention.de>

Co-authored-by: Philipp Hahn <hahn@univention.de>

tests/pytype_blacklist.txt

@@ -15,3 +15,7 @@ third_party/2and3/attr/converters.pyi
 third_party/2and3/attr/filters.pyi
 third_party/2and3/attr/validators.pyi
 third_party/2and3/pynamodb/models.pyi
+
+# https://github.com/google/pytype/issues/613
+third_party/2and3/nmap/__init__.pyi
+third_party/2and3/nmap/nmap.pyi