Smoke test failed on ubuntu 20.04

[weizhouapache]

see #6031 (comment)

Trillian test result (tid-3520)
Environment: kvm-ubuntu20 (x2), Advanced Networking with Mgmt server u20
Total time taken: 36070 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr6031-t3520-kvm-ubuntu20.zip
Smoke tests completed. 91 look OK, 1 have errors
Only failed tests results shown below:

Test	Result	Time (s)	Test File
test_01_migrate_VM_and_root_volume	Error	70.02	test_vm_life_cycle.py
test_02_migrate_VM_with_two_data_disks	Error	49.82	test_vm_life_cycle.py

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• Bug Report

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[nvazquez]

Fixed on #6116