Package maintainer reported off-list, that the package
also works with php7. So lets migrate the dependencies
to prepare the php5 removal.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

database
Signed-off-by: Jean-Michel Lacroix <lacroix@lepine-lacroix.info>
bandwidthd-php is a set of PHP files that allows to graph bandwidthd
data stored in a postgresql database.  This bandwidthd data can be
generated using bandwidthd-pgsql in OpenWRT or LEDE or with
bandwidthd on different OS (Windows, Linux for example).

Addition of a config file and an init file.
Modification of the Makefile to take in account the changes above
Signed-off-by: Jean-Michel Lacroix <lacroix@lepine-lacroix.info>