krb5 commit: Fix k5test prompts for Python 3

https://github.com/krb5/krb5/commit/297535b72177dcced036b78107e9d0e37781c7a3
commit 297535b72177dcced036b78107e9d0e37781c7a3
Author: Greg Hudson <[email protected]>
Date:   Wed Jul 25 11:50:02 2018 -0400

    Fix k5test prompts for Python 3
    
    With Python 3, sys.stdout.write() of a partial line followed by
    sys.stdin.readline() does not display the partial line.  Add explicit
    flushes to make prompts visible in k5test.py.
    
    ticket: 8710

 src/util/k5test.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/util/k5test.py b/src/util/k5test.py
index 848eb02..6001246 100644
--- a/src/util/k5test.py
+++ b/src/util/k5test.py
@@ -468,6 +468,7 @@ def _onexit():
     if _debug or _stop_before or _stop_after or _shell_before or _shell_after:
         # Wait before killing daemons in case one is being debugged.
         sys.stdout.write('*** Press return to kill daemons and exit script: ')
+        sys.stdout.flush()
         sys.stdin.readline()
     for proc in _daemons:
         os.kill(proc.pid, signal.SIGTERM)
@@ -669,6 +670,7 @@ def _valgrind(args):
 def _stop_or_shell(stop, shell, env, ind):
     if (_match_cmdnum(stop, ind)):
         sys.stdout.write('*** [%d] Waiting for return: ' % ind)
+        sys.stdout.flush()
         sys.stdin.readline()
     if (_match_cmdnum(shell, ind)):
         output('*** [%d] Spawning shell\n' % ind, True)