Add virt-v2v logs to targeted gathering

[aufi]

Adding logs of virt-v2v pod which is created per-VM and has name based
on Plan name and VM ID. The log contains virt-v2v conversion info.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=2023680

[aufi]

Custom image for test: quay.io/maufart/forklift-must-gather:latest

[aufi]

Example output:

.
└── namespaces
    ├── test
    │   ├── crs
    │   │   ├── datavolume
    │   │   │   ├── mig-plan-vm-6919-lrs2p.yaml
    │   │   │   └── mig-plan-vm-7442-lrjdh.yaml
    │   │   └── virtualmachine
    │   │       ├── test-x2019.yaml
    │   │       └── mini-rhel7-test.yaml
    │   └── logs
    │       ├── importer-mig-plan-vm-6919-lrs2p
    │       │   └── current.log
    │       ├── importer-mig-plan-vm-7442-lrjdh
    │       │   └── current.log
    │       ├── mig-plan-vm-6919-xdf4h    <-- this is the virt-v2V conversion pod log
    │       │   └── current.log
    │       └── virt-launcher-test-x2019-k95k4
    │           └── current.log
    └── openshift-mtv
        ├── crs
        │   └── plan
        │       └── mig-plan.yaml
        └── logs
            ├── forklift-controller-74db549fd4-6bchw
            │   └── current.log
            └── forklift-must-gather-api-655d9b87d7-cfrxr
                └── current.log

[fabiendupont]

LGTM