tree a35ba0c0a9d9e2e48ad22e25a68d6f71218e4f48
parent 82116150a20d8ccdb03fb2066ad9e4303cb0cc67
author Sergey Rogulenko <rogulenko@google.com> 1439244588 -0700
committer Sergey Rogulenko <rogulenko@google.com> 1439244588 -0700

watch: refactoring required for the client watch

This change precedes the client watch implementation and contains
refactoring with some minor fixes. The intention is to reuse more
code.

The main parts are:
- v23/syncbase/nosql: rename Stream to ScanStream and extract
  common Stream interface from ScanStream and ResultStream
  (also WatchStream is coming)
- move Watch methods from server/nosql/database.go to
  server/nosql/database_watch.go
- move watch log helpers from watchable/util.go to
  watchable/watcher.go
- move the WatchLogBatch() func from vsync/ to watchable/
  together with the test

Change-Id: Iaab18a1ec6dd218e85284bd994ed71e766feab26