tests: Add simple umockdev-record → umockdev-run roundtrip test
tests: Add simple umockdev-record → umockdev-run roundtrip test

This detects whether the output and input formats are compatible. This
is also provided by /umockdev-record/system-all, but that is a brittle
test.

martinpitt/umockdev,martinpitt/umockdev,martinpitt/umockdev