[cmake-developers] find_package() verbosity

[Nils Gladitz]

Are there any official recommendations or opinions on how verbose a find 
module (or package configuration file) should be on success?

- Find modules using FindPackageHandleStandardArgs report success once.

- FindBoost.cmake reports success every time.

- Qt5 package configuration files (and find_package() in CONFIG mode 
specifically) keep quiet on success.

Nils