[3517] Corrected test for interface detection.

[3517] Corrected test for interface detection.

The original version of this test incorrectly matched the names of the
interfaces detected by the IfaceMgr and those detected by the unit test.
As a result, the interfaces with similar names (e.g. virbr0 and virbr0-nic)
where compared for the equality of indexes, addresses and flags.