File README.SUSE of Package ganglia-web

You need to enable the apache2 php7 or php5 module, before ganglia-web works.
SLE-12* is shipped with php5 and SLE-15* is shipped with php7, for this 
products you also have to add the "Web and Scripting Module".
This can be done with
a2enmod php7
a2enmod php5

apache2 must be restarted after this

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