Change exit codes for usage and version to 0. Closes #1870 (#1873)
Change exit codes for usage and version to 0. Closes #1870 (#1873)


ohsu-comp-bio/cromwell,broadinstitute/cromwell,broadinstitute/cromwell,broadinstitute/cromwell,broadinstitute/cromwell,broadinstitute/cromwell,ohsu-comp-bio/cromwell,ohsu-comp-bio/cromwell