tempest: Log server console output of failed SSH

Tempest has a code in its base class. As we inherit from API base class
in tempest tests, we lost this capability. This patch adds a copy from
tempest code.

Change-Id: I24fc7e4c5f2726a16af15288987e65b77532e709
1 file changed
tree: f754069708546b9608335a885ddad46c1650d87e
  1. neutron/