Merge branch 'ag/t7004-modernize'

Coding style fixes to a test script. * ag/t7004-modernize: t7004: make use of write_script t7004: use single quotes instead of double quotes t7004: begin the test body on the same line as test_expect_success t7004: description on the same line as test_expect_success t7004: do not prepare things outside test_expect_success t7004: use indented here-doc t7004: one command per line t7004: remove space after redirect operators