Merge branch 'ss/wt-status-committable'

Code clean-up in the internal machinery used by "git status" and "git commit --dry-run". * ss/wt-status-committable: roll wt_status_state into wt_status and populate in the collect phase wt-status.c: set the committable flag in the collect phase t7501: add test of "commit --dry-run --short" wt-status: rename commitable to committable wt-status.c: move has_unmerged earlier in the file