Flush output to notify without blocking in http-disk-server callers

Signed-off-by: Ronan Abhamon <ronan.abhamon@vates.tech>

http_disk_server.py

@@ -87,6 +87,8 @@ def check_bindable(port):
 
 def eprint(str):
     print(OUTPUT_PREFIX + str, file=sys.stderr)
+    # Flush to ensure we can read messages in another process without waiting.
+    sys.stderr.flush()
 
 def is_drbd_device(path):
     try:

nbd_http_server.py

@@ -67,6 +67,8 @@ def run_or_ignore(fun):
 
 def eprint(str):
     print(OUTPUT_PREFIX + str, file=sys.stderr)
+    # Flush to ensure we can read messages in another process without waiting.
+    sys.stderr.flush()
 
 # -----------------------------------------------------------------------------
 
@@ -247,10 +249,6 @@ def clean_paths():
 
     try:
         nbd = attach_nbd(socket_path, nbd_name, pid_path)
-        # Flush to ensure we can read output (like NBD device used)
-        # in another process without waiting.
-        sys.stdout.flush()
-        sys.stderr.flush()
         while True:
             try:
                 if SIGTERM_RECEIVED: