Each puppet run tries to update composer

[FlorianSW]

Since the php module was introduced to manage the php installation and the composer installation on the servers, each puppet run now tries to update composer. This results in a message like:
Notice: /Stage[main]/Php::Composer::Auto_update/Exec[update composer]/returns: executed successfully
for each puppet run, the run will then be marked as "changed", even if no update of composer was done. The module should, by default, only attempt to update composer after 30 days, iirc.