Add possibility to specify duration in the QoD APIs

[T-sm]

• I uploaded version 1.2.0 of the API definitions to QualityOnDemand subdirectory prepared by DT.

• The new version implements the duration parameter of CreateSession component schema and a _SESSIONTERMINATED event when the session ends/expires. The duration property is defined as follows:

  duration:
    type: integer
    example: 86400
    description: |
      Session duration in seconds. Maximal value of 24 hours is used if not set.
      After session has expired the client will receive SESSION_TERMINATED event. See notification callback.
    format: int32
    minimum: 1
    maximum: 86400