pull up r24138 from trunk

pull up r24138 from trunk

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 r24138 | tlyu | 2010-06-18 15:41:48 -0400 (Fri, 18 Jun 2010) | 13 lines

 ticket: 6744
 subject: only test t_locate_kdc if known-good DNS name is present
 target_version: 1.8.3
 tags: pullup

Running "make check" while offline or on a firewalled network may
result in failure in lib/krb5/os because the invocation of
t_locate_kdc requires that the DNS servers for ATHENA.MIT.EDU be
reachable.  Autodetect DNS utilities "dig" and "nslookup", and use
them to check for existence of the known-good DNS name.  Also
parameterize the test so that the known-good DNS name can be
overridden on the make command line.

ticket: 6744
version_fixed: 1.8.3
status: resolved

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-8@24195 dc483132-0cff-0310-8789-dd5450dbe970