Merge branch 'feature/consistent-cron-env' into 'develop'

Source /etc/profile from cron.sh

See merge request ispconfig/ispconfig3!1640

server/cron.sh

@@ -2,6 +2,8 @@
 
 PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/sbin:/usr/local/bin:/usr/X11R6/bin
 
+. /etc/profile
+
 if [ -f /usr/local/ispconfig/server/lib/php.ini ]; then
         PHPINIOWNER=`stat -c %U /usr/local/ispconfig/server/lib/php.ini`
         if [ $PHPINIOWNER == 'root' ] || [ $PHPINIOWNER == 'ispconfig'  ]; then