[FAB-13848] Fix flaky integration test in raft cft
[FAB-13848] Fix flaky integration test in raft cft

Test may query chaincode too fast after invocation, before block
is actually committed.

Change-Id: I4159fb2dfb31310eccfd64fcb9a9a99ceef54db0
Signed-off-by: Jay Guo <91d7eeb83d08be0dc56ea674009c4b53383e15b3@gmail.com>

xixuejia/fabric,xixuejia/fabric,xixuejia/fabric