Merge changes If4f9886b,I2bb3ffd6,I234ec6a3,Ib237f078,I2d8092ab, ...

* changes:
  Fix behavior of `watch dump`
  Close `watch print` gracefully with user interrupt
  Print monitored tag information from new connected clients
  Lock buffer before printing package name
  Add clear command to `watch` command
  Standardize print format for outputs from `watch` command
  Fix help message for watch command