FindBoost: Improve messages when a Boost CMake package is found

Add a test for this case to verify the messages.  This test will also be
valuable to cover this code path in which we've had several regressions
recently.

Modules/FindBoost.cmake

@@ -245,10 +245,9 @@ if (NOT Boost_NO_BOOST_CMAKE)
   # If we found boost-cmake, then we're done.  Print out what we found.
   # Otherwise let the rest of the module try to find it.
   if (Boost_FOUND)
-    message("Boost ${Boost_FIND_VERSION} found.")
+    message(STATUS "Boost ${Boost_FIND_VERSION} found.")
     if (Boost_FIND_COMPONENTS)
-      message("Found Boost components:")
-      message("   ${Boost_FIND_COMPONENTS}")
+      message(STATUS "Found Boost components:\n   ${Boost_FIND_COMPONENTS}")
     endif()
     # Restore project's policies
     cmake_policy(POP)

Tests/RunCMake/CMakeLists.txt

@@ -141,6 +141,7 @@ add_RunCMake_test(DisallowedCommands)
 add_RunCMake_test(ExternalData)
 add_RunCMake_test(FeatureSummary)
 add_RunCMake_test(FPHSA)
+add_RunCMake_test(FindBoost)
 if(NOT CMAKE_C_COMPILER_ID MATCHES "Watcom")
   add_RunCMake_test(GenerateExportHeader)
 endif()

Tests/RunCMake/FindBoost/CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.9)
+project(${RunCMake_TEST} NONE)
+include(${RunCMake_TEST}.cmake)

Tests/RunCMake/FindBoost/CMakePackage-stdout.txt

@@ -0,0 +1,3 @@
+-- Boost 1\.12345 found\.
+-- Found Boost components:
+   date_time

Tests/RunCMake/FindBoost/CMakePackage.cmake

@@ -0,0 +1,2 @@
+set(Boost_DIR ${CMAKE_CURRENT_SOURCE_DIR}/CMakePackage)
+find_package(Boost 1.12345 COMPONENTS date_time)

Tests/RunCMake/FindBoost/CMakePackage/BoostConfigVersion.cmake

@@ -0,0 +1,7 @@
+set(PACKAGE_VERSION 1.12345)
+if(PACKAGE_FIND_VERSION_MAJOR EQUAL 1)
+  set(PACKAGE_VERSION_COMPATIBLE 1)
+  if(PACKAGE_FIND_VERSION_MINOR EQUAL 12345)
+    set(PACKAGE_VERSION_EXACT 1)
+  endif()
+endif()

Tests/RunCMake/FindBoost/RunCMakeTest.cmake

@@ -0,0 +1,3 @@
+include(RunCMake)
+
+run_cmake(CMakePackage)