Description of problem:
In v2v/import dialog, the "External Provider" field values are refreshed only for "Source" field value changes and not for "Data Center" field value changes as required.
In case there is an "external provider" exists for an "external source" and data center, opening the import vms dialog and first selecting the relevant dc and then selecting the relevant external source, caused the "external Provider" field values to stay as is and not refreshed according to the selected datacenter and therefore the appropriate external provider is not available to be chosen.
Only after re-selecting the external source, the External Provider field is refreshed.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Declare an "external provider" for a specific external source and datacenter.
2.Open the "import Virtual machine(s) (v2v) dialog and first select the relevant datacenter and then select the relevant external source.
3.Open the pull down menu of the "External Provider" field.
the appropriate "external provider" declared in (1) is not displayed in pull down menu.
the appropriate "external provider" declared in (1) should be displayed.
not backported to 4.0 branch
trivial one-liner for 4.0.2