Commits on May 3, 2019

1. api: Add consume_first for convenience …

   A lot of actors are expecting only one type and are using next to
   retrieve the value. This patch introduces a convenience function that is
   simplifying the usage for actors that have a need for this.
   
   Additionally it covers some gotchas that are mostly not handled, mainly
   if there is no message available then an empty tuple is returned that is
   not iterable by next.
   
   Usage example:
   --------------
   
   ```
   from leapp.libraries.stdlib import api
   from leapp.models import SomeModel
   
   def some_function_previously():
       value = next(api.consume(SomeModel), None)
       value_other = next(api.consume(SomeModel), SomeModel())
       value_different = next(api.consume(SomeModel), 'yadda')
   
   def some_function_now():
       value = api.consume_first(SomeModel)
       value_other api.consume_first_default(SomeModel)
       value_different = api.consume_first(SomeModel, 'yadda')
   ```
   
   Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>

   

   vinzenz committed May 3, 2019
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