vr: fix python exception when configure VRs

[ustcweizhou]

Description

This PR fixes #4474

before

root@r-27-VM:/var/cache/cloud# /opt/cloud/bin/configure.py monitor_service.json
ERROR:root:Command 'ip link show eth0 | grep 'state DOWN'' returned non-zero exit status 1

with this change

root@r-27-VM:/var/cache/cloud# /opt/cloud/bin/configure.py monitor_service.json
root@r-27-VM:/var/cache/cloud#

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

[ravening]

LGTM

[DaanHoogland]

change makes sense, but not tested.

[yadvr]

@blueorangutan package

[blueorangutan]

@rhtyd a Jenkins job has been kicked to build packages. I'll keep you posted as I make progress.

[blueorangutan]

Packaging result: ✔centos7 ✖centos8 ✔debian. JID-2418

[yadvr]

@blueorangutan test

[blueorangutan]

@rhtyd a Trillian-Jenkins test job (centos7 mgmt + kvm-centos7) has been kicked to run smoke tests

[blueorangutan]

Trillian test result (tid-3228)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 31812 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr4489-t3228-kvm-centos7.zip
Intermittent failure detected: /marvin/tests/smoke/test_kubernetes_clusters.py
Smoke tests completed. 83 look OK, 0 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File