Make _get_router() non-private

_get_router() 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: I53e894edb6b44c25923f6075e5c6f6d4268a63f4
2 files changed