Fix some issues for "sort by last activity"

* The result from topicListLastUpdatedStorage should convert UUID from binary to alpha
  ( missed rebase from UUID improvement patch )

* TopicListStorage::insert() takes array of arrays instead of an array
  ( missed rebase from Multiput patch )

* topic last activity timestamp should be always the same as topic workflow
  last modified timestamp.  We should not use wfTimestampNow() but use
  the time from topicworkflow.  If they are not the same, update to topKIndex
  would not be able to remove the old record

Change-Id: I637da2350d62f8a86b3263db8039b9475ee0f88b
Merge "Fix some issues for "sort by last activity""