adding rf library for cordvtn tests

Change-Id: Idbb1d1d2a6276c1a62297700741a42332a3909c0
diff --git a/src/test/setup/requirements.txt b/src/test/setup/requirements.txt
index df3a16b..713b3e5 100644
--- a/src/test/setup/requirements.txt
+++ b/src/test/setup/requirements.txt
@@ -12,6 +12,7 @@
 robotframework
 robotframework-requests
 robotframework-sshlibrary
+robotframework-httplibrary
 paramiko==1.10.1
 twisted
 pexpect