getDataStream() returns non-const ptr now

Change-Id: I6d1e811622cda61575464df8e4036b388a4ab706
drop useless const_cast

Change-Id: I8a14faf56303b986c3e6c8e9bec53210ae86fc87
drop useless const_cast

Change-Id: Ie5e6f519a511931b383b6131a4a188abb3396946
do not disable complete test, just the one file

Change-Id: I1acccba8c2ef44d76c13eadb97d03119f08baa1d