imap-send: display port alongwith host when git credential is invoked

When requesting for passsword, git credential helper used to display
only the host name. For example:

    Password for 'imaps://gargaditya08%[email protected]':

Now, it will display the port along with the host name:

    Password for 'imaps://gargaditya08%[email protected]:993':

This has been done to make credential helpers more specific for ports.
Also, this behaviour will also mimic git send-email, which displays
the port along with the host name when requesting for a password.

FWIW, if no port is specified by the user, the default port, 993 for
IMAPS and 143 for IMAP is used by the code. So, the case of no port
defined for the helper is not possible, and therefore is not added.

Signed-off-by: Aditya Garg <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: AdityaGarg8

imap-send.c

@@ -1104,7 +1104,7 @@ static void server_fill_credential(struct imap_server_conf *srvc, struct credent
 		return;
 
 	cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
-	cred->host = xstrdup(srvc->host);
+	cred->host = xstrfmt("%s:%d", srvc->host, srvc->port);
 
 	cred->username = xstrdup_or_null(srvc->user);
 	cred->password = xstrdup_or_null(srvc->pass);