Current StartContext and StopContext asynchronous behaviour is not very intuitive
from API user perspective and may lead to concurrency issues when misused.
We will introduce new and more secure asynchronous behaviour.
Since now on StartContext and StopContext execution will become asynchronous if
and only if both conditions:

• context.asynchronous() was issued
• and Service lifecycle method (either start() or stop()) finished its execution
  are satisfied.