rose suite-hook: plug lock directory gaps.
rose suite-hook: cleaner logic.
rose suite-hook: more DB connection retries.
rose suite-hook: more frequent DB connection retries.
rose suite-hook: use single DB connection.
Merge pull request #729 from matthewrmshin/fix.rose-slv

rose suite-hook: plug lock directory gaps.
Merge branch 'master' of github.com:metomi/rose into gh-pages