dev_scripts: remove warnings

This isn't strictly a bugfix, but it is low risk as it does only
impact dev_scripts.
graph: remote superfluous -T in cmdline

munin-graph runs from cron, so -T is uneeded.

It is even harmful, since -T makes it ignore environnement vars. And
it is the only cron-runned part that uses it, as the code origins as
a fork of munin-cgi-graph.
Merge branch 'fix-minor' into stable-2.0
master: fix TLS enabled updates

As Christian Schroetter reported TLS updates do not work anymore
in 2.0.

This was due to a bug accurately pinpointed by Eero Häkkinen :

   The fetch_service_config method in the file Master/Node.pm is
   changed to use the new _node_read_fast() method which uses
   sysread for reading from a socket and bypasses the TLS layer
   completely.

This commit delegate a _node_read_fast() call to _node_read()
when tls is enabled.

Closes: D:699803