[suggestion] Remove "Dependency X already found" messages

[daniel-eiband-snkeos]

Multiple status messages in the form "Dependency X already found" are logged when consuming Conan packages using the cmake_find_package_multi generator by calling find_package(), for example find_package(gRPC REQUIRED NO_MODULE). These messages can not be silenced with the CMake variable CONAN_CMAKE_SILENT_OUTPUT (they should maybe also be silenced when passing the QUIET option which currently doesn't seem to be the case: find_package(gRPC QUIET) - also see https://github.com/conan-io/conan/issues/9959).

My suggestion is to remove these messages completely, because they do not provide any useful information to the user.

• The message is expected in many situation: When two dependencies A and B of my project both have a dependency to C then it is expected that after find_package(A) the call find_package(B) will output that C is already found. There is nothing a user can do to "fix" this message.
• Files generated by Conan often produce multiple of these messages even if my project only has a single dependency. As of today, the generated file gRPCConfig.cmake contains find_dependency(absl REQUIRED NO_MODULE) and the line message(STATUS "Dependency absl already found") 13 times resulting in 12 messages "Dependency absl already found" from a single dependency alone. Again there is nothing that can be done to "fix" this.

Typical output when using Protobuf and gRPC:

-- Dependency ZLIB already found
-- Dependency protobuf already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency ZLIB already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency OpenSSL already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency absl already found
-- Dependency absl already found

• [x] I've read the CONTRIBUTING guide.

Environment Details

• Operating System: Windows 10 Enterprise 20H2
• Conan version: 1.50.0
• Python version: 3.7.3

[lasote]

Sorry, we are not maintaining the old generators anymore, only for blocking bugs. The only recommended (to be prepared to 2.0 where the cmake_*** are removed) is the CMakeDeps + CMakeToolchain. There we took better care of the verbosity of the messages already. Thanks.