There is possible data race condition while distributing private data,
since now we have to support dynamic collections, where it's possible
that collection config might be updated right after the endorsement,
therefore in distributor while looking up for collection config from
collection store we might get updated config which might be not lober
relevant for the private data in context.

This commit refactors the distribution flow my actually making use of
the collection config which is available at the endorsement time,
which also allows to optimize, since reduces the need to execute
queries with collection store. Additional since using collection config
which was available during endorsement allows to elliminate the race
condition. Addresses comments of code-review: CR-21491.

Change-Id: I0d3c682a613bf3ae5b46e32230fadf6b12895fdf
Signed-off-by: Artem Barger <bartem@il.ibm.com>