Switch from using GLOBAL_VM_PROPERTIES hash

to GLOBAL_INJECTED_<name> variables

Change-Id: Ibbb28f3eaaa1cbad9b6df64d3b2edf8876c24d51
Signed-off-by: Jerry Flood <jf9860@att.com>
diff --git a/robot/resources/openstack/keystone_interface.robot b/robot/resources/openstack/keystone_interface.robot
index 6c48e12..63f7245 100644
--- a/robot/resources/openstack/keystone_interface.robot
+++ b/robot/resources/openstack/keystone_interface.robot
@@ -51,5 +51,4 @@
     [Return]   ${user}   ${pass}
 
 Get Openstack Credentials
-    Dictionary Should Contain Key  ${GLOBAL_VM_PROPERTIES}   openstack_username
-    [Return]   ${GLOBAL_VM_PROPERTIES['openstack_username']}    ${GLOBAL_VM_PROPERTIES['openstack_password']}
\ No newline at end of file
+    [Return]   ${GLOBAL_INJECTED_OPENSTACK_USERNAME}    ${GLOBAL_INJECTED_OPENSTACK_PASSWORD}
\ No newline at end of file