Travis changes:

Travis changes:
a) add job to check for empty APLOGNO() macros
b) don't install CPAN stuff if SKIP_TESTING is set
c) don't tail the error_log on test suite failure since it's almost
   always irrelevant shutdown stuff and obscures the actual failures
d) use coloured grep output when showing segfaults to make them obvious in the
   travis error_log output.
   e.g. https://travis-ci.org/github/apache/httpd/jobs/703517978#L2537

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1879370 13f79535-47bb-0310-9956-ffa450edef68