use single ssh connection to onos
It belongs to VOL-4041 and is the second part.
Keyword 'Execute ONOS CLI Command on open connection' is deprecated
and is replaced by keyword
'Execute ONOS CLI Command use single connection' for all test suites
and libraries.

Change-Id: Ib5078b50d22e812e927e437a0e6f0e249f95ee9a
diff --git a/tests/software-upgrades/ONOS_AppsUpgrade.robot b/tests/software-upgrades/ONOS_AppsUpgrade.robot
old mode 100644
new mode 100755
index 222ef7e..fbd04db
--- a/tests/software-upgrades/ONOS_AppsUpgrade.robot
+++ b/tests/software-upgrades/ONOS_AppsUpgrade.robot
@@ -83,7 +83,7 @@
     FOR    ${J}    IN RANGE    0    ${num_apps_under_test}
         ${app_ut}=    Set Variable    ${list_onos_apps_under_test}[${J}][app]
         Run Keyword And Continue On Failure    Wait Until Keyword Succeeds    ${timeout}    2s
-        ...    Execute ONOS CLI Command on open connection    ${onos_ssh_connection}
+        ...    Execute ONOS CLI Command use single connection    ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}
         ...    log:set DEBUG ${app_ut}
     END
     FOR    ${I}    IN RANGE    0    ${num_apps_under_test}
@@ -116,8 +116,6 @@
     [Documentation]    Set up the test suite
     Common Test Suite Setup
     Create ONOS Apps Under Test List
-    ${onos_ssh_connection}    Open ONOS SSH Connection    ${ONOS_SSH_IP}    ${ONOS_SSH_PORT}
-    Set Suite Variable    ${onos_ssh_connection}
 
 Teardown Suite
     [Documentation]    Replaces the Suite Teardown in utils.robot.