Skip all network-based checks (#7641)
Skip all network-based checks (#7641)

* Skip all network-based checks

Change the warnings in diagnose to a friendly messages when allow_url_fopen is disabled.

Issue: #7622
fabpot/composer,stof/composer,localheinz/composer,naderman/composer,floverdevel/composer,milleruk/composer,nicolas-grekas/composer,staabm/composer,stefangr/composer,johnstevenson/composer,pierredup/composer,slbmeh/composer,andrerom/composer,composer/composer,alcohol/composer