Teach our cmdline tests to optionally use a different kind ofrepository layout than the classic greek tree.The greek tree is not really suitable for testing peg revision parsing inthe client, since it has no files or directories with an @-sign in thenames. The new repository layout (called the trojan tree, heh heh) can beselected at sandbox build time by each test case individually.Note that we do not keep precooked versions of the trojan tree for FSFSversion compatibility tests, since its primary purpose is testing clientoperations in the working copy.[In subversion/tests/cmdline]* davautocheck.sh: Add a <Location> to access the pristine trojan tree.* pegrev_parse_tests.py (do_move_with_at_signs): Use the trojan tree for the tests.* svntest/actions.py (_setup_pristine_repo): New; extracted from setup_pristine_greek_repository. (setup_pristine_repositories): Renamed fom setup_pristine_greek_repository. Build both the greek and the trojan pristine repositories. Update callers. (_guarantee_repos): New; extracted from guarantee_greek_repository. (guarantee_greek_repository): Just call _guarantee_repos. (guarantee_trojan_repository): New. (make_repo_and_wc): Add 'tree' parameter to select the greek or trojan tree.* svntest/main.py: (Item): Imported StateItem from svntest.wc. (_item): Remove previsous alias for StateItem. (pristine_trojan_repos_url, pristine_trojan_repos_dir, trojan_dump_dir): New global variables. (greek_state): Use Item instead of _item in initializer. (trojan_state): New. (execute_tests): Calculate the pristine_trojan_repos_url.* svntest/sandbox.py (Sandbox._set_name): Add 'tree' parameter to select the greek or trojan tree. (Sandbox.build): Likewise, making 'greek' the default.