CORD-2084 Explicitly install cryptography package

Change-Id: Idbf0ef320d07408930ed4bed1a7857a845b49e95
diff --git a/scripts/cord-bootstrap.sh b/scripts/cord-bootstrap.sh
index 36040ab..b4f3b2f 100644
--- a/scripts/cord-bootstrap.sh
+++ b/scripts/cord-bootstrap.sh
@@ -16,6 +16,7 @@
 #     sudo apt-get install -y software-properties-common
 #     sudo apt-add-repository -y ppa:ansible/ansible
     sudo apt-get -y install python-dev libffi-dev python-pip libssl-dev sshpass python-netaddr
+    sudo pip install cryptography==1.9
     sudo pip install ansible==2.2.2.0
   fi