Debian packages usability: webserver not required, causing missing webserver configuration

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When installing intelmq-manager via deb packages, the user will be faced with two challenges:

• installing intelmq-manager does not pull in the required intelmq-api
• installing intelmq-manager without having apache already preinstalled, does not pull in apache by itself and does not enable the configuration:
  

  intelmq-manager/debian/intelmq-manager.postinst

  Lines 5 to 8 in 387b039

  	if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
  	. /usr/share/apache2/apache2-maintscript-helper
  	apache2_invoke enmod headers
  	apache2_invoke enconf intelmq-manager

  
  Therefore installing intelmq-api or apache2 after installing intelmq-manager, will result in /etc/apache2/conf-enabled/intelmq-manager.conf not existing and requires a re-configuration or re-installation of the package.

See also the threads https://lists.cert.at/pipermail/intelmq-users/2021-March/000233.html and https://lists.cert.at/pipermail/intelmq-users/2021-March/000221.html on the mailinglist

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This was fixed in bd8c698