Update to version 2.0.4.
Changes since 2.0 include:
o Fix segfault with net io engine and no file/hostname given.
o Fix net engine client read server write bug.
o Fix early termination of runs caused by ramp_time > runtime
o Implement zoned random I/O testing support
o Fix thread hang when using async engines (libaio,etc.) when too low of a iops
o Make random map allocation more resilient
o Fail if we can't satisfy the minimum block size
o Enable completion latency stat collection on verify
o Fix bandwidth logging for mixed read/write workloads.
o Token-based flow control
o Fix IOPS logging for mixed read/write workloads
o Use crc32c for the verify_header checksum
o client: exit if no jobs were sent and client is idle