engine: Fix audit log for network on multiple interfaces

The patch fixes the place holder name inside the properties file
to be a correlated with the parameter within the code.

Change-Id: Ibda3f6e6d78a0fed2ea2b5d7879d717f859793e8
Bug-Url: https://bugzilla.redhat.com/881055
Signed-off-by: Moti Asayag <masayag@redhat.com>