Bug#36196214 testNdbProcess fails under ASan+UBSan

In testNdbProcess-t, in read_response(), the timeout waiting for
a pipe to become readable was too short. Increase it from 50ms
to 250ms.

Change-Id: I83fdc7d1a2c6474ab4253b9e77e49496eb6aef8f

Author: jdduncan

storage/ndb/src/common/util/testNdbProcess.cpp

@@ -93,8 +93,8 @@ bool read_response(NdbProcess::Pipes &pipes, FILE *rfp) {
   response[0] = 'F';
   bool match = false;
 
-  /* Wait 50ms for socket to become readable, then read response */
-  if (pollReadable(pipes.parentRead(), 50) == 1) {
+  /* Wait 250ms for socket to become readable, then read response */
+  if (pollReadable(pipes.parentRead(), 250) == 1) {
     if (fread(response, 8, 1, rfp) == 1) {
       response[8] = '\0';
       match = !strcmp(response, "goodbye.");