adding pyyaml to venv setup

Change-Id: I35e51c6b9e86ff348f86eb23ad4eac76400c8b33
diff --git a/src/test/setup/venv-apitests.sh b/src/test/setup/venv-apitests.sh
index 1579897..8c08b92 100644
--- a/src/test/setup/venv-apitests.sh
+++ b/src/test/setup/venv-apitests.sh
@@ -29,4 +29,4 @@
 fi
 
 # install pip packages
-pip install robotframework robotframework-sshlibrary robotframework-requests robotframework-httplibrary pexpect
+pip install robotframework robotframework-sshlibrary robotframework-requests robotframework-httplibrary pexpect pyyaml