Install httpie on head-node for fabric config

Change-Id: I71345ce3be1f19a69e6966fdf77b2e4220164bc8
(cherry picked from commit c18aa9fc65f85247adc07b68b8c7925c35323222)
diff --git a/Jenkinsfile-rcord b/Jenkinsfile-rcord
index aef7c91..42817f0 100644
--- a/Jenkinsfile-rcord
+++ b/Jenkinsfile-rcord
@@ -62,6 +62,8 @@
                        cp fabric-network-cfg.json fabric-network-cfg.json.\$(date +%Y%m%d-%H%M%S)
                        cord generate > fabric-network-cfg.json
                        """)
+        // Install httpie on the head-node
+        runHeadNodeCmd("sudo pip install httpie")
         // Delete old ONOS netcfg
         runHeadNodeCmd("http -a onos:rocks DELETE http://onos-fabric:8181/onos/v1/network/configuration/")
         // Load new configuration