Merge pull request #69007 from MaxKellermann/test__missing_includes

test: add missing includes

Reviewed-by: Ilya Dryomov <idryomov@gmail.com>

diff --cc src/test/osd/ECPeeringTestFixture.cc
Simple merge

diff --cc src/test/osd/PGBackendTestFixture.cc
Simple merge

diff --cc src/test/osd/TestBackendBasics.cc
Simple merge