Add cord tester robotframework dependencies

Change-Id: Ic4517128ff1d05f3a6fe2c205b588253898d7330
diff --git a/src/test/setup/prerequisites.sh b/src/test/setup/prerequisites.sh
index 194eceb..ef3d1a5 100755
--- a/src/test/setup/prerequisites.sh
+++ b/src/test/setup/prerequisites.sh
@@ -38,7 +38,9 @@
 pip install -U netaddr
 pip install -U python-daemon
 pip install scapy-ssl_tls
-pip install robotframework
+pip install -U robotframework
+pip install -U robotframework-requests
+pip install -U robotframework-sshlibrary
 ( cd /tmp && git clone https://github.com/jpetazzo/pipework.git && cp -v pipework/pipework /usr/bin && rm -rf pipework )
 ## Special mode to pull cord-tester repo in case prereqs was installed by hand instead of repo
 if [ "$1" = "--test" ]; then