Add missing HTTPS_PORT references

Several tests (probably more than I've found) are missing references to
HTTPS_PORT. This adds the missing reference which gives them a better
chance to pass in qemu or non-standard port setups.

Change-Id: I9807f4410702d9645db8e44b7d20cda912e21d84
Signed-off-by: Matt Fischer <matthew.fischer@hpe.com>
diff --git a/security/test_bmc_connections.robot b/security/test_bmc_connections.robot
index ca07e42..0d7d189 100644
--- a/security/test_bmc_connections.robot
+++ b/security/test_bmc_connections.robot
@@ -29,7 +29,7 @@
 ${loop_iteration}     ${1000}
 ${hostname}           testhostname
 ${MAX_UNAUTH_PER_IP}  ${5}
-${bmc_url}            https://${OPENBMC_HOST}
+${bmc_url}            https://${OPENBMC_HOST}:${HTTPS_PORT}
 
 
 *** Test Cases ***