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
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