vent: add paramiko to requirements.txt

BUG=chromium:778025
TEST=module imports within venv

Change-Id: If86b4f16cb71363775256c18e94f348b067dc495
Reviewed-on: https://chromium-review.googlesource.com/736680
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 33d7081..2219897 100644
--- a/venv/requirements.txt
+++ b/venv/requirements.txt
@@ -6,6 +6,7 @@
 funcsigs==1.0.2
 mock==2.0.0
 oauth2client==3.0.0
+paramiko==1.17.2
 pbr==1.10.0
 pip==8.1.2
 psutil==4.3.1