autotest: add pyasn1 requirements

BUG=chromium:770989
TEST=bin/python_venv -c "from pyasn1.codec.ber import decoder"

Change-Id: I786670e823c8b165b3d4ae6bd0f2616a6cd12de1
Reviewed-on: https://chromium-review.googlesource.com/696668
Commit-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Allen Li <ayatane@chromium.org>
diff --git a/venv/requirements.txt b/venv/requirements.txt
index f478ff5..3d180bc 100644
--- a/venv/requirements.txt
+++ b/venv/requirements.txt
@@ -8,6 +8,8 @@
 pip==8.1.2
 psutil==4.3.1
 py==1.4.34
+pyasn1==0.1.9
+pyasn1-modules==0.0.8
 pytest==3.1.3
 pytest-catchlog==1.2.2
 pytest-cov==2.5.1