Make _get_network_by_name() non-private

_get_network_by_name() 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: Ia102acea773bd80d933a7e0a19b447f91134f81f
1 file changed