query-part: ignore the URI part for given protocols

By setting PROTOPT_NOURLQUERY in the protocol handler struct, the
protocol will get the "query part" of the URL cut off before the data is
handled by the protocol-specific code. This makes libcurl adhere to
RFC3986 section 2.2.

Test 1220 is added to verify a file:// URL with query-part.

lib/imap.c

@@ -125,7 +125,8 @@ const struct Curl_handler Curl_handler_imap = {
   ZERO_NULL,                        /* readwrite */
   PORT_IMAP,                        /* defport */
   CURLPROTO_IMAP,                   /* protocol */
-  PROTOPT_CLOSEACTION | PROTOPT_NEEDSPWD /* flags */
+  PROTOPT_CLOSEACTION | PROTOPT_NEEDSPWD
+  | PROTOPT_NOURLQUERY              /* flags */
 };
 
 
@@ -151,7 +152,8 @@ const struct Curl_handler Curl_handler_imaps = {
   ZERO_NULL,                        /* readwrite */
   PORT_IMAPS,                       /* defport */
   CURLPROTO_IMAP | CURLPROTO_IMAPS, /* protocol */
-  PROTOPT_CLOSEACTION | PROTOPT_SSL | PROTOPT_NEEDSPWD /* flags */
+  PROTOPT_CLOSEACTION | PROTOPT_SSL | PROTOPT_NEEDSPWD
+  | PROTOPT_NOURLQUERY              /* flags */
 };
 #endif