Add support for varnishncsa format.

It is similar to ncsa_extended but has protocol and hostname inside the request.
https://varnish-cache.org/docs/7.5/reference/varnishncsa.html#notes

Author: lapo-luchini

import_logs.py

@@ -595,6 +595,12 @@ def get(self, key):
 )
 
 
+_VARNISH_NCSA_LOG_FORMAT = (
+    r'(?P<ip>[\w*.:-]+)\s+\S+\s+(?P<userid>\S+)\s+\[(?P<date>.*?)\s+(?P<timezone>.*?)\]\s+'
+    r'"(?P<method>\S+)\s+(?P<protocol>https?)://(?P<host>[^/]+)(?P<path>.*?)\s+\S+"\s+(?P<status>\d+)\s+(?P<length>\S+)'
+    r'\s+"(?P<referrer>.*?)"\s+"(?P<user_agent>.*?)"'
+)
+
 _S3_LOG_FORMAT = (
     r'\S+\s+(?P<host>\S+)\s+\[(?P<date>.*?)\s+(?P<timezone>.*?)\]\s+(?P<ip>[\w*.:-]+)\s+'
     r'(?P<userid>\S+)\s+\S+\s+\S+\s+\S+\s+"(?P<method>\S+)\s+(?P<path>.*?)\s+\S+"\s+(?P<status>\d+)\s+\S+\s+(?P<length>\S+)\s+'
@@ -628,6 +634,7 @@ def get(self, key):
     'common_vhost': RegexFormat('common_vhost', _HOST_PREFIX + _COMMON_LOG_FORMAT),
     'ncsa_extended': RegexFormat('ncsa_extended', _NCSA_EXTENDED_LOG_FORMAT),
     'common_complete': RegexFormat('common_complete', _HOST_PREFIX + _NCSA_EXTENDED_LOG_FORMAT),
+    'varnishncsa': RegexFormat('varnishncsa', _VARNISH_NCSA_LOG_FORMAT),
     'w3c_extended': W3cExtendedFormat(),
     'amazon_cloudfront': AmazonCloudFrontFormat(),
     'incapsula_w3c': IncapsulaW3CFormat(),