master: remove munin_writeconfig_sql()

It is not needed anymore, since a higher-level dump is done.
dev_scripts: only emit the filename

This is to enable something like :

    vi $( dev_scripts/dump_sql )
master/Update: reuse the std dump function
master: adding the node attributes in the SQL
master: adding groups in SQL
master: uniform whitespaces
Revert "master: adding the type of the node"

This reverts commit d303893972fc51dc0ad58f02bc4fb60a48685d28.

Conflicts:
	master/lib/Munin/Master/Update.pm
master: ignore redundant config structure