Make _get_server_port_id_and_ip4() non-private

_get_server_port_id_and_ip4() is made public by this commit as
the tempest.scenario.manager interface is meant to be
consumed by tempest plugins.

Implements: blueprint tempest-scenario-manager-stable
Signed-off by: Soniya Vyas<svyas@redhat.com>

Change-Id: I25bf66fff0892a87face97660127e92479ef8100
2 files changed