fix: handle big list of hp disk

we cant use p.wait() if too much data.

netbox_agent/raid/hp.py

@@ -18,14 +18,14 @@ def ssacli(sub_command):
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT
     )
-    p.wait()
-    stdout = p.stdout.read().decode("utf-8")
-    if p.returncode != 0 and 'does not have any physical' not in stdout:
+    stdout, stderr = p.communicate()
+    stdout = stdout.decode("utf-8")
+    if p.returncode != 0:
         mesg = "Failed to execute command '{}':\n{}".format(
             " ".join(command), stdout
         )
         raise HPRaidControllerError(mesg)
-    else:
+
     if 'does not have any physical' in stdout:
         return list()
     else: