Increase composer::install timeout and make it configurable
Increase composer::install timeout and make it configurable

Preumably the intent of COMPOSER_PROCESS_TIMEOUT=600 was to allow
Composer to work for up to 10 minutes, but Puppet has its own
timeout which is lower. Sync the two, and allow overriding for
specific directories (sometimes 10 minutes is not enough).

Change-Id: I11ee54d0ae688f71a329a4049f9e0ec523f4fd39

wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant