Merge changes from topics 'feat/keep_vnf', 'YARDSTICK-886'

* changes:
  Add _create_new_stack method
  Update TaskParser to deal with qualified name in Context
  Add qualified name to Context

diff --cc yardstick/benchmark/core/task.py
Simple merge

diff --cc yardstick/common/exceptions.py
index 4562c48,2af4c63..41d7b88
--- 1/yardstick/common/exceptions.py
--- 2/yardstick/common/exceptions.py
+++ b/yardstick/common/exceptions.py
@@@ -68,10 -68,13 +68,18 @@@ class HeatTemplateError(YardstickExcept
  class IPv6RangeError(YardstickException):
      message = 'Start IP "%(start_ip)s" is greater than end IP "%(end_ip)s"'
  
 +
 +class TrafficProfileNotImplemented(YardstickException):
 +    message = 'No implementation for traffic profile %(profile_class)s.'
 +
 +
  class DPDKSetupDriverError(YardstickException):
      message = '"igb_uio" driver is not loaded'
+ 
+ 
+ class ScenarioConfigContextNameNotFound(YardstickException):
+     message = 'Context name "%(context_name)s" not found'
+ 
+ 
+ class StackCreationInterrupt(YardstickException):
+     message = 'Stack create interrupted.'

diff --cc yardstick/tests/unit/benchmark/core/test_task.py
Simple merge