[PATCH] py3: conditionalize BaseHTTPServer, SimpleHTTPServer and CGIHTTPServer import

[Pulkit Goyal]

>      (r'^import httplib', "don't use httplib, use util.httplib"),
> +    (r'^import BaseHTTPServer', "don't use BaseHTTPServer, use util.httpserver"),

check-code complaint of this line thats its too long. So I send a new
patch where I trimmed the message.