Merge branch 'cp/unit-test-reftable-merged'

Another reftable test has been ported to use the unit test framework. * cp/unit-test-reftable-merged: t-reftable-merged: add test for REFTABLE_FORMAT_ERROR t-reftable-merged: use reftable_ref_record_equal to compare ref records t-reftable-merged: add tests for reftable_merged_table_max_update_index t-reftable-merged: improve the const-correctness of helper functions t-reftable-merged: improve the test t_merged_single_record() t: harmonize t-reftable-merged.c with coding guidelines t: move reftable/merged_test.c to the unit testing framework