Ensure `wp post list` returns posts of all statuses by default, as WP_Query behaves differently in the WP_ADMIN context.

See #412
Fix typo
Behat step for checking a CSV contains string
Refactor checkThatCsvStringContainsCsvString() such that:
* expected CSV can be in any row of the actual CSV
* actual CSV must contain all expected CSV data rows
Test: `wp post list` should contain both 'draft' and 'publish' posts
add post_status to `wp post list` output
Merge pull request #422 from wp-cli/post-list-status

Ensure `wp post list` returns posts of all statuses by default