Reverted unnecessary removal of policy id prefix
Created by: rvillido
This modification reverts the change that was done to remove policy id prefix. For example, "urn:oid:1.2.3" policy id was changed to "1.2.3".
Estonian BDOC containers contain policy id with value "urn:oid:1.3.6.1.4.1.10015.1000.3.2.1". If the prefix "urn:oid:" would be removed, then the BDOC containers validation would be broken.
The reverted change comes from this commit: https://github.com/esig/dss/commit/329910a9ac24ecbbff2b411b1d97034723d2de44#diff-f65ad7d4afec3524299b85446c4e1f3dR648