Fix VM with ISO attached migration issue

[nvazquez]

Description

As previously described by PR #3929:
If vm has attached ISO, the migration fails with error message "org.libvirt.LibvirtException: Cannot access storage file /mnt/b33e5a1d-e4ea-3465-b6ac-c98dc8ff8af0/207-2-cc5fd717-2d57-3bb3-bcf6-2c930268db6c.iso"

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)

Screenshots (if appropriate):

How Has This Been Tested?

[nvazquez]

@blueorangutan package

[blueorangutan]

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

[blueorangutan]

Packaging result: ✖centos6 ✔centos7 ✔debian. JID-1002

[yadvr]

@blueorangutan test

[blueorangutan]

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

[weizhouapache]

tested ok.
create a vm with registered iso, migrations succeed.

did not test iso which is direct downloaded.

[weizhouapache]

@nvazquez can you change the destination branch to 4.13 ?
I think same issue exists in 4.13

[nvazquez]

@blueorangutan package

[blueorangutan]

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

[blueorangutan]

Packaging result: ✖centos6 ✔centos7 ✔debian. JID-1007

[blueorangutan]

Trillian test result (tid-1189)
Environment: kvm-centos7 (x2), Advanced Networking with Mgmt server 7
Total time taken: 27825 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr3935-t1189-kvm-centos7.zip
Smoke tests completed. 81 look OK, 0 have error(s)
Only failed tests results shown below:

Test	Result	Time (s)	Test File

[DaanHoogland]

@blueorangutan test

[blueorangutan]

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

[nvazquez]

@weizhouapache @rhtyd branch base moved to 4.13 - also verified ISO direct download and migration works