Find dependencies quietly?

[Alex Merry]

(CC'ing Stephen because this is relevant to the version of
find_dependency in CMake master)

Currently, the find_dependency() macro does not pass the QUIET argument
to find_package unless the parent package was being found quietly.  This
means that feature_summary() prints out all the transitive dependencies
in addition to the main dependency.

I think this makes the feature summary much less useful, because it is
difficult to see what is going on with such a long list, and these
requirements are not independent of each other.

So, I think that find_dependency should pass QUIET to find_package
whether or not the parent package is being found quietly.

Do other people agree?

Alex