flush output

This will ensure that the stderr and stdout are running synchroniously.
The output in journalctl will now make more sense.

backupmanager.j2

@@ -47,7 +47,11 @@ def run_command(command, env=None):
     current_env = os.environ.copy()
     if env is not None:
         current_env.update(env)
+    sys.stdout.flush()
+    sys.stderr.flush()
     process = subprocess.run(command, shell=True, env=current_env)
+    sys.stdout.flush()
+    sys.stderr.flush()
     if process.returncode != 0:
         raise RuntimeError(f"Command '{command}' failed with return code {process.returncode}, environment is {env}")
 
@@ -55,8 +59,12 @@ def get_command(command, env=None, full_return=False):
     current_env = os.environ.copy()
     if env is not None:
         current_env.update(env)
+    sys.stdout.flush()
+    sys.stderr.flush()
     process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True, env=current_env)
     output, error = process.communicate()
+    sys.stdout.flush()
+    sys.stderr.flush()
     return_code = process.poll()
     if full_return:
         return output.decode().strip(), error.decode().strip(), return_code