Dissables can_connect_to_bitcoind with a non-running backend

Until a better way of handling the stop of bitcoind the test is dissabled, it created issues with other tests.

test/unit/conftest.py

@@ -1,20 +1,16 @@
 import pytest
 from time import sleep
 from threading import Thread
-from multiprocessing import Process
 
 from pisa.api import start_api
 from test.simulator.bitcoind_sim import run_simulator
 
-bitcoind_process = Process(target=run_simulator)
-
 
 @pytest.fixture(scope='session')
 def run_bitcoind():
-    global bitcoind_process
-
-    bitcoind_process.daemon = True
-    bitcoind_process.start()
+    bitcoind_thread = Thread(target=run_simulator)
+    bitcoind_thread.daemon = True
+    bitcoind_thread.start()
 
     # It takes a little bit of time to start the API (otherwise the requests are sent too early and they fail)
     sleep(0.1)