fix execute strategy and add try except

[qimolin]

Reason for pull request

After discussion with the TA about the execute strategy, we came to the conclusion that the strategy in UPISAS is incorrect.

Current behavior

It checks the adaptation_options input against the execute schema while we expect the input to be the adaptation from the adaptation endpoint.

Expected behavior

• Check adaptation input against adaptation_options_schema (not required because you would have to call the adaptation_options_schema first in the test)
• Make a put request to execute with the adaptation_options
• Check the response from the request against the execute_schema

Additionally

Added try except in _start_server_and_wait_until_is_up to make sure it retries connection to the server after failure