Merge PR #29124 into master

* refs/pull/29124/head:
	test/old/test*buffers.cc: remove tests against bufferlist
	test/old/test_*seek_read: remove this test
	test/old/test{crush,bucket}: remove stale tests
	test/old/testmpi.cc: remove this test
	test/old/testxattr.cc: remove this test
	test/old/testtree.cc: remove test for BinaryTree

Reviewed-by: Sage Weil <sage@redhat.com>