Feature 11001: Robot framework linting for E2E tests

This change includes robotframework-lint and robocop checks which will
improve code maintenance.

In addition, all references to ROBOT_DEVOPS_FOLDER have been properly
replaced in all testsuites.

Change-Id: I6efb306b51302d0400240bcd57435f0990021415
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/robot-systest/lib/connectivity_lib.resource b/robot-systest/lib/connectivity_lib.resource
new file mode 100644
index 0000000..e91aedd
--- /dev/null
+++ b/robot-systest/lib/connectivity_lib.resource
@@ -0,0 +1,41 @@
+*** Comments ***
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+
+*** Settings ***
+Documentation   Library providing keywords for testing connectivity to hosts via ping.
+Library   OperatingSystem
+
+
+*** Variables ***
+${SUCCESS_RETURN_CODE}   0
+${CONNECTIVITY_POL_TIME}   5sec
+${CONNECTIVITY_MAX_WAIT_TIME}   30sec
+
+
+*** Keywords ***
+Test Ping Host
+    [Documentation]   Run Ping
+    ...               Parameters:
+    ...                  host: IP or name of the host
+    ...               Execution example:
+    ...                  Ping Test   \${host}
+    [Arguments]   ${host}
+    ${rc}   ${stdout}=   Run And Return Rc And Output   ping -c 2 -W 1 ${host}
+    Log   ${stdout}
+    Should Be Equal As Integers   ${rc}   ${SUCCESS_RETURN_CODE}
+
+Test Connectivity
+    [Documentation]   Ping a host several times during ${CONNECTIVITY_MAX_WAIT_TIME} until it succeeds or raises a timeout.
+    [Arguments]   ${host}
+    Wait Until Keyword Succeeds   ${CONNECTIVITY_MAX_WAIT_TIME}   ${CONNECTIVITY_POL_TIME}   Test Ping Host   ${host}