[1LP][RFR] Fixing TC v2v_custom_attribute

[mnadeem92]

Signed-off-by: mnadeem92 mnadeem@redhat.com

The Test case was failing as the resources flavor and security group are not available to the cluster.

The Test case is to test the custom attribute flavor and security group by providing a new value for these params other than the default one.
security-group:
default --> provider.data.security_groups.admin[0]
custom value --> provider.data.security_groups.admin[1]
flavor
default --> provider.data.flavors[0]
custom value --> provider.data.flavors[1]

As per TC requirement, we are not required to change the cluster, however in TC cluster gets changed from "admin" to "on-qa" , However the above security-group and flavor is a part of "admin" project and not available in on-qa cluster, This was the main reason for TC failure.

This PR fixing this issue.

{{ pytest: cfme/tests/v2v/test_v2v_migrations_ui.py -k "test_v2v_custom_attribute" --use-provider osp13-ims --use-provider vsphere67-ims --provider-limit 2 -v }}

[jarovo]

It took me a good while, but I think I am beginning to grasp what is going on here. The code used to change more than one field. It happens that change to field, that is not relevant to the test, makes some values in other field, that is relevant, invalid and that breaks the test. The fix here is to change only one relevant field.

In total, you are removing bunch of lines and I believe making broken test passing, hopefully still validly. thumbs up