https://jira.hyperledger.org/browse/FAB-2086



We need this method for getting information
of block in a ledger by txID.
Also this method helps to check valid tx or not
by getting the validation bit array
from the block.

Change-Id: I4216635097ecd4cf5de9e3442dfbd5660d44292f
Signed-off-by: Ruslan Kryukov <ruslan.kryukov@ru.ibm.com>