Add an automate event for DrsMigrateVM_Task

[agrare]

This adds an automate event instance for the DrsMigrateVM_Task event
which is a more specific subclass of the MigrateVM_Task class.

https://bugzilla.redhat.com/show_bug.cgi?id=1788540

[miq-bot]

Checked commit agrare@fbca988 with ruby 2.5.5, rubocop 0.69.0, haml-lint 0.20.0, and yamllint 1.10.0
0 files checked, 0 offenses detected
Everything looks fine. 👍

[coveralls]

Pull Request Test Coverage Report for Build 4095

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.389%

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Totals
Change from base Build 4092:	0.0%
Covered Lines:	3021
Relevant Lines:	3102

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💛 - Coveralls

[lfu]

We could either add DrsMigrateVM_Task or add the policy call to existing event DrsMigrateVM_Task_Complete.

@gmcculloug which way would be better?

[agrare]

So I went with this because it mirrors the MigrateVM_Task behavior, I thought it'd be confusing if things were different between a manual migration and an automated DRS migration.

[lfu]

@agrare Sounds good to me.

[gmcculloug]

I agree that we should keep it similar to the MigrateVM_Task event. I think this way would allow for the ability to cancel the task from policy if needed. Users could always override this and the DrsMigrateVM_Task_Complete event if they really needed to switch the logic.

[agrare]

Thanks @gmcculloug , I'll leave it up to you if you think this is enough to consider the BZ "fixed"

[simaishi]

@agrare @gmcculloug can this be hammer/yes?

[simaishi]

Hammer backport details:

$ git log -1
commit fce92275b1ba8c1cc5a08512cf2ca1cc8ff52ff0
Author: Greg McCullough <gmccullo@redhat.com>
Date:   Tue Jan 7 12:11:23 2020 -0500

    Merge pull request #625 from agrare/add_drs_migrate_vm_task_event

    Add an automate event for DrsMigrateVM_Task

    (cherry picked from commit 1196ecced601c9729c4c74335d212460470b7333)

    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1794573

[simaishi]

Ivanchuk backport details:

$ git log -1
commit 9f958b91a78c18eadf6ef1497e81cbc7c34d37f7
Author: Greg McCullough <gmccullo@redhat.com>
Date:   Tue Jan 7 12:11:23 2020 -0500

    Merge pull request #625 from agrare/add_drs_migrate_vm_task_event

    Add an automate event for DrsMigrateVM_Task

    (cherry picked from commit 1196ecced601c9729c4c74335d212460470b7333)

    Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1794574