Created attachment 1313044 [details]
engine logs

Description of problem:
When trying to update DC name (and description) through REST API there is an error about MAC pool, but there is no need for MACs to change or migrate or anything, so this error should not be shown.

Also there are some variables that are not extended with values.

Version-Release number of selected component (if applicable):
ovirt-engine-4.2.0-0.0.master.20170811144920.gita423008.el7.centos.noarch

How reproducible:
always

Steps to Reproduce:
1.2017-08-13 15:18:48,562 - MainThread - datacenters - DEBUG - PUT request content is --  url:/ovirt-engine/api/datacenters/$dc_id body:<data_center>
    <name>golden_env_mixedupdated</name>
    <description>Data Center Description</description>
</data_center>

Actual results:
2017-08-13 15:18:48,633 - MainThread - api_utils - ERROR - Failed to update element NOT as expected:
	Status: 409
	Reason: Conflict
	Detail: [Cannot migrate MACs to another MAC pool, because that action would create duplicates in target MAC pool, which are not allowed. Problematic MACs are ${ACTION_TYPE_FAILED_CANNOT_MIGRATE_MACS_DUE_TO_DUPLICATES_LIST}, $action type failed cannot migrate macs due to duplicates list 	00:1a:4a:16:88:ca,
	00:1a:4a:16:88:cb,
	00:1a:4a:16:88:c9,
	00:1a:4a:16:88:cc,
	00:1a:4a:16:88:cd,
	...]

Expected results:
updated dc name (and description)

Additional info: