urgent bug fixes for danube (1)

urgent bug fixes for danube (1)

- create "doctor_net" and use it in VM creation in order to avoid
  virtual network issues

- make sample inspector use keystone v3

- use "openstack compute service set" for unset force_down

- drop nova_force_down.py as keystone returns nova v2.1

- use '--os-project-name' except for ceilometer cli

- avoid ping check (wait_ping) with empty "COMPUTE_IP"

- add missing '$' in quota update args

- move ping check (wait_ping) into unset_forced_down_hosts() and
  perform ping check only to downed compute hosts

- use wait_until() instead of wait_ping()

- put out unset_forced_down_hosts from collect_logs()

JIRA: DOCTOR-95

Co-Authored-By: Carlos Goncalves <carlos.goncalves@neclab.eu>
Change-Id: I3275ff5dd993b82029dac6a58087096baa251022
Signed-off-by: Ryota MIBU <r-mibu@cq.jp.nec.com>