kustomize/filesys: Tests are failing on macOS

[stefanprodan]

--- FAIL: Test_isSecurePath (0.00s)
    --- FAIL: Test_isSecurePath/relative_symlink (0.00s)
        fs_secure_test.go:592: 
            Expected success, but got an error:
                <*errors.errorString | 0xc0001f0ef0>: {
                    s: "path '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Patwt/subdir/subsubdir/symlink' is not in or below '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Patwt/subdir'",
                }
                path '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Patwt/subdir/subsubdir/symlink' is not in or below '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Patwt/subdir'
    --- FAIL: Test_isSecurePath/absolute_symlink (0.00s)
        fs_secure_test.go:592: 
            Expected success, but got an error:
                <*errors.errorString | 0xc0001f1120>: {
                    s: "path '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Pilfs/subdir/subsubdir/symlink' is not in or below '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Pilfs/subdir'",
                }
                path '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Pilfs/subdir/subsubdir/symlink' is not in or below '/var/folders/fm/v67j6c7n1k5g46m38yb15yvm0000gn/T/securefs-Pilfs/subdir'