Disable PHP warnings for noblogs

They're very verbose and generally result from legacy themes / plugins
misusing the core Wordpress code.

roles/noblogs/templates/99-noblogs.ini.j2

 [PHP]
+; Disable warnings.
+error_reporting = E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR
+
 ; Set generous memory limits.
 memory_limit = 256M