add 1s post-command delay to tests 513 and 514

addressing http://curl.haxx.se/mail/lib-2009-12/0031.html

tests/data/test513

@@ -17,7 +17,8 @@ lib513
  <name>
 send HTTP POST using read callback that returns CURL_READFUNC_ABORT
  </name>
- <command>
+# the 1s post-command delay helps to prevent a spurious failure on s390
+ <command delay="1">
 http://%HOSTIP:%HTTPPORT/513
 </command>
 </client>

tests/data/test514

@@ -29,7 +29,8 @@ lib514
  <name>
 First set options to POST and then to make HEAD
  </name>
- <command>
+# the 1s post-command delay helps to prevent a spurious failure on s390
+ <command delay="1">
 http://%HOSTIP:%HTTPPORT/514
 </command>
 </client>