apache2 package reworked

Hi, I had taken bsc#1178478 as an opportunity to rework package a bit. After we get Apache/apache2 state into Factory, I think it will be ready for cautious testing. Notable changes: * package is now massively tested with upstream testsuite * update-alternatives are used to provide httpd command and modules under /usr/lib64/apache2 * APACHE_EXTENDED_STATUS="lua" gives something like https://httpd.apache.org/server-status Please report me any oddity you spot. Petr -- Have a lot of fun!