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Revert "test/libalias: Tests for instantiation and outgoing NAT"

Description

Revert "test/libalias: Tests for instantiation and outgoing NAT"

11-STABLE to too different. libalias misses to many patches to keep
in touch with the planned improvement. Even the tests infrastructure
needs adjustments to prevent build (install) failures.

This reverts commit b4b99d2333faeb6ba383dcabde5d0e4c90cf23de.