Bug#720414: apache2-dev: invoking apache2-maintscript-helper should be protected with -r, not -e

[Julian Gilbey <jdg@debian.org>]

Package: apache2-dev
Version: 2.4.6-2
Severity: minor

The example maintainer script fragment in
/usr/share/doc/apache2/PACKAGING.gz and the dh_apache2 script protect
the call to source the apache2-maintscript-helper shell script with a
[ -e ... ] (file exists); better would be [ -r ... ] (file is
readable).

   Julian