adding tests for --keep-mgmt-net

tests/01-smoke/07-keep-mgmt-net.robot

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+*** Comments ***
+This test suite verifies
+- the management bridge is not deleted when --keep-mgmt-net is present and the lab is destroyed
+- the management bridge is deleted by default
+
+*** Settings ***
+Library           OperatingSystem
+Library           String
+Suite Teardown    Run    sudo containerlab --runtime ${runtime} destroy -t ${topo} --cleanup
+
+*** Variables ***
+${lab-name}       7-keep-mgmt-net
+${topo}           ${CURDIR}/07-linux-single-node.clab.yml
+${mgmt-bridge}    01-07-net
+
+*** Test Cases ***
+Deploy ${lab-name} lab
+    Log    ${CURDIR}
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo containerlab --runtime ${runtime} deploy -t ${topo}
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+
+Destroy ${lab-name} lab keep mgmt net
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo containerlab --runtime ${runtime} destroy -t ${topo} --keep-mgmt-net
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+
+Check ${lab-name} mgmt network remains
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo ip l show dev ${mgmt-bridge}
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+
+Deploy ${lab-name} lab again
+    Log    ${CURDIR}
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo containerlab --runtime ${runtime} deploy -t ${topo}
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+
+Destroy ${lab-name} lab dont keep mgmt net
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo containerlab --runtime ${runtime} destroy -t ${topo} --cleanup
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+
+Check ${lab-name} mgmt network is gone
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo ip l show dev ${mgmt-bridge}
+    Log    ${output}
+    Should Not Be Equal As Integers    ${rc}    0

tests/01-smoke/07-linux-single-node.clab.yml

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+# Copyright 2020 Nokia
+# Licensed under the BSD 3-Clause License.
+# SPDX-License-Identifier: BSD-3-Clause
+
+name: single-node
+mgmt:
+  bridge: 01-07-net
+
+topology:
+  nodes:
+    l1:
+      kind: linux
+      image: alpine:3
+      cmd: ash -c "sleep 9999"