ClearCase: Improved performance for indexing dynamic views

For dynamic views we only at initial sync/indexing check for checked out
files. When a file is opened it will be reindexed if needed. The very time
consuming recursive listing of all vobs is not needed as for snapshot
views.

Change-Id: I83d4ab70efdd311b6f3239ab45569c6d1810e10f
Reviewed-by: Orgad Shaneh <orgads@gmail.com>