title: How to execute a scenario from a step in another scenario?
body: <p>Below is the example I want to execute a scenario in another scenario. 
  How can I do this?<br>
  I've already known that I execute the other steps by using <code>execute_steps()</code>.</p>
  
  <p>My environment:
  macOS v10.14.1, Docker v18.06.1-ce, Django v2.1.4, behave v1.2.6, behave-django v1.1.0</p>
  
  <pre><code>Scenario: scenarioA
      Given ~
      When ~
      Then ~
  
  Scenario: scenarioB
      Given scenarioA is completed # I want to exexute scenarioA here.
      When ~
      Then ~
  </code></pre>
  
  <p>Is there an api to run the scenario from the name of the scenario?<br>
  Is there an api that gets scenarios from scenario names and divides them into steps?</p>