XCCDF: Collect only unique IPs in the facts list (but also collect them under XCCDF1.3 predefined name)
XCCDF: Collect only unique IPs in the facts list (but also collect
them under XCCDF1.3 predefined name)

This change also changes the way how MAC addresses are being collected.
Now the scanner would also take into the account MACs from interfaces
that have no IPv4(6)-family addresses assigned.

OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap,OpenSCAP/openscap