IMPALA-9098: bump Impyla to 0.16.1

This includes a bugfix for fetch requests returning 0 rows,
which was resulting in Impyla truncating results for
some tests.

Testing:
Ran exhaustive tests.

Change-Id: Iee3afdcc2f25f0e094c6d2531a83da79045d01be
Reviewed-on: http://gerrit.cloudera.org:8080/14733
Reviewed-by: David Knupp <dknupp@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
diff --git a/infra/python/deps/compiled-requirements.txt b/infra/python/deps/compiled-requirements.txt
index 821415d..4f85330 100644
--- a/infra/python/deps/compiled-requirements.txt
+++ b/infra/python/deps/compiled-requirements.txt
@@ -19,7 +19,7 @@
 # after the toolchain is bootstrapped. Installed after requirements.txt
 
 argparse == 1.4.0
-impyla == 0.15.0
+impyla == 0.16.1
   bitarray == 0.9.0
   sasl == 0.1.3
   six == 1.11.0