Update AUTH_URI variable in connections as global

Resolves openbmc/openbmc-test-automation#47

Change-Id: Ieb4788d9609748675c4e7a8f5c3f32423ad61a30
Signed-off-by: Sridevi Ramesh <sridevra@in.ibm.com>
diff --git a/lib/connection_client.robot b/lib/connection_client.robot
index 1e74357..2cc8413 100755
--- a/lib/connection_client.robot
+++ b/lib/connection_client.robot
@@ -23,4 +23,4 @@
     ${SSH_PORT}=    Replace Variables     ${port_num}
 
     ${https_num}=   Convert To Integer    ${HTTPS_PORT}
-    ${AUTH_URI}=    Replace Variables     https://${OPENBMC_HOST}:${https_num}
+    Set Global Variable     ${AUTH_URI}    https://${OPENBMC_HOST}:${https_num}