Merge branch 'bc/hash-independent-tests'

Tests that rely on the exact hardcoded values of object names have been updated in preparation for hash function migration. * bc/hash-independent-tests: t2107: abstract away SHA-1-specific constants t2101: abstract away SHA-1-specific constants t2101: modernize test style t2020: abstract away SHA-1 specific constants t1507: abstract away SHA-1-specific constants t1411: abstract away SHA-1-specific constants t1405: sort reflog entries in a hash-independent way t1300: abstract away SHA-1-specific constants t1304: abstract away SHA-1-specific constants t1011: abstract away SHA-1-specific constants