Verify certificates can be uploaded with custom root cert path

tests/RobotFramework/tests/tedge/tedge_upload_cert_custom_root_cert_path.robot

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+*** Settings ***
+Documentation    Run certificate upload test and fails to upload the cert because there is no root certificate directory,
+...              Then check the negative response in stderr              
+
+Resource    ../../resources/common.resource
+Library    ThinEdgeIO
+
+Test Tags    theme:cli    theme:mqtt    theme:c8y    adapter:docker
+Test Teardown         Get Logs
+
+*** Test Cases ***
+tedge cert upload c8y respects root cert path
+    [Setup]    Setup With Self-Signed Certificate
+    Execute Command    sudo tedge disconnect c8y
+    ${output}=    Execute Command    sudo tedge cert renew    stderr=${True}    stdout=${False}    ignore_exit_code=${True}
+    Should Contain    ${output}    Certificate was successfully renewed, for un-interrupted service, the certificate has to be uploaded to the cloud
+    Execute Command    mv /etc/ssl/certs /etc/ssl/certs_test
+    Execute Command    tedge config set c8y.root_cert_path /etc/ssl/certs_test
+    Execute Command    cmd=sudo env C8Y_USER='${C8Y_CONFIG.username}' C8Y_PASSWORD='${C8Y_CONFIG.password}' tedge cert upload c8y
+    ${output}=    Execute Command    sudo tedge connect c8y
+    Should Contain    ${output}    Connection check is successful.
+
+*** Keywords ***
+Setup With Self-Signed Certificate
+    ${DEVICE_SN}=                    Setup    skip_bootstrap=${True}
+    Set Test Variable               $DEVICE_SN
+    Execute Command           test -f ./bootstrap.sh && ./bootstrap.sh --cert-method selfsigned