tests: Updated SMTP tests to decouple client initial response

Updated test903 and test904 following the addition of CURLOPT_SASL_IR
as the default behaviour of SMTP AUTH responses is now to not include
the initial response. New tests with --sasl-ir support to follow.

tests/data/test903

@@ -13,7 +13,8 @@ RFC4954
 <reply>
 <servercmd>
 REPLY EHLO 250 AUTH PLAIN
-REPLY AUTH 235 Authenticated
+REPLY AUTH 334 PLAIN supported
+REPLY dGVzdAB0ZXN0ADEyMzQ= 235 Authenticated
 </servercmd>
 </reply>
 
@@ -39,7 +40,8 @@ smtp://%HOSTIP:%SMTPPORT/user --mail-rcpt 903@foo --mail-from 903@from -u test:1
 <verify>
 <protocol>
 EHLO user
-AUTH PLAIN dGVzdAB0ZXN0ADEyMzQ=
+AUTH PLAIN
+dGVzdAB0ZXN0ADEyMzQ=
 MAIL FROM:<903@from>
 RCPT TO:<903@foo>
 DATA

tests/data/test904

@@ -12,7 +12,8 @@ RFC4954
 <reply>
 <servercmd>
 REPLY EHLO 250 AUTH LOGIN
-REPLY AUTH 334 UGFzc3dvcmQ6
+REPLY AUTH 334 LOGIN supported
+REPLY dGVzdA== 334 UGFzc3dvcmQ6
 REPLY MTIzNA== 235 Authenticated
 </servercmd>
 </reply>
@@ -39,7 +40,8 @@ smtp://%HOSTIP:%SMTPPORT/user --mail-rcpt 904@foo --mail-from 904@from -u test:1
 <verify>
 <protocol>
 EHLO user
-AUTH LOGIN dGVzdA==
+AUTH LOGIN
+dGVzdA==
 MTIzNA==
 MAIL FROM:<904@from>
 RCPT TO:<904@foo>