commitlog_tests: Add segment corruption tests
commitlog_tests: Add segment corruption tests

Test entry and chunk corruption. 

duarten/scylla,raphaelsc/scylla,kjniemi/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,kjniemi/scylla,kjniemi/scylla,scylladb/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,raphaelsc/scylla,avikivity/scylla,raphaelsc/scylla,scylladb/scylla