krb5 commit [krb5-1.13]: Relax t_sn2princ.py reverse resolution test

[Tom Yu]

https://github.com/krb5/krb5/commit/eaebfbd3b6200b81c2550af1cb8f58a436b11e02
commit eaebfbd3b6200b81c2550af1cb8f58a436b11e02
Author: Tom Yu <tlyu at mit.edu>
Date:   Fri May 27 15:19:43 2016 -0400

    Relax t_sn2princ.py reverse resolution test
    
    Relax t_sn2princ.py check of the reverse resolution of the test
    hostname.  The new requirement is that it be different from the
    forward resolved hostname.  (There is also an existing implicit
    requirement that it be in the mit.edu domain.)  This makes
    t_sn2princ.py more robust against changes in the reverse resolution of
    the test hostname.
    
    (back ported from commit 45b34f8e8f10009435d86195ac17e02d1dd0684e)
    
    ticket: 8422
    version_fixed: 1.13.6
    tags: -pullup
    status: resolved

 src/tests/t_sn2princ.py |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/tests/t_sn2princ.py b/src/tests/t_sn2princ.py
index de6bb0e..3b5fef8 100644
--- a/src/tests/t_sn2princ.py
+++ b/src/tests/t_sn2princ.py
@@ -73,7 +73,6 @@ if offline:
 # and reverse resolving to these names.
 oname = 'ptr-mismatch.kerberos.org'
 fname = 'www.kerberos.org'
-rname = 'kerberos-org.mit.edu'
 
 # Verify forward resolution before testing for it.
 try:
@@ -94,8 +93,10 @@ try:
     names = socket.getnameinfo(sockaddr, socket.NI_NAMEREQD)
 except socket.gaierror:
     skip_rest('cannot reverse resolve %s' % oname)
-if names[0].lower() != rname:
-    skip_rest('%s reverse resolves to %s, not %s' % (oname, names[0], rname))
+rname = names[0].lower()
+if rname == fname:
+    skip_rest('%s reverse resolves to %s '
+              'which should be different from %s' % (oname, rname, fname))
 
 # Test default canonicalization (forward and reverse lookup).
 test(oname, rname, 'R3')