3782: Restore config settings changed during tests. (copied from API server)
3782: Stub IO.pipe() with StringIO instead of stubbing content with KEEP_LOCAL_STORE.
3782: Avoid using a huge read buffer when client requests a huge range. Add test.
3782: Merge branch 'master' into 3782-stub-io-pipe
Merge branch '3782-stub-io-pipe' refs #3782