Add support to execute cord-tester validation suite through ROBOT framework.

Change-Id: I3c6a1cd5f3824d78a0ab56fd2abbf307d39966fa
diff --git a/src/test/setup/prerequisites.sh b/src/test/setup/prerequisites.sh
index 183d763..194eceb 100755
--- a/src/test/setup/prerequisites.sh
+++ b/src/test/setup/prerequisites.sh
@@ -38,6 +38,7 @@
 pip install -U netaddr
 pip install -U python-daemon
 pip install scapy-ssl_tls
+pip install robotframework
 ( 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