Set parallel execution method as abstract

When we are not implementing a method, we need to set that method as
abstract inside the concrete classes.

Author: acerv

ltp/host.py

@@ -6,6 +6,7 @@
 .. moduleauthor:: Andrea Cervesato <[email protected]>
 """
 import os
+import abc
 import time
 import select
 import signal
@@ -221,6 +222,14 @@ def run_command(self,
 
             return ret
 
+    @abc.abstractmethod
+    def run_multiple_commands(
+            self,
+            commands: list,
+            timeout: float = 3600,
+            command_completed: callable = None) -> list:
+        pass
+
     def fetch_file(
             self,
             target_path: str,

ltp/qemu.py

@@ -7,6 +7,7 @@
 """
 import os
 import re
+import abc
 import time
 import signal
 import select
@@ -568,6 +569,14 @@ def run_command(
 
             return ret
 
+    @abc.abstractmethod
+    def run_multiple_commands(
+            self,
+            commands: list,
+            timeout: float = 3600,
+            command_completed: callable = None) -> list:
+        pass
+
     def fetch_file(
             self,
             target_path: str,

ltp/ssh.py

@@ -6,6 +6,7 @@
 .. moduleauthor:: Andrea Cervesato <[email protected]>
 """
 import os
+import abc
 import time
 import select
 import socket
@@ -375,6 +376,14 @@ def run_command(
 
             return ret
 
+    @abc.abstractmethod
+    def run_multiple_commands(
+            self,
+            commands: list,
+            timeout: float = 3600,
+            command_completed: callable = None) -> list:
+        pass
+
     def fetch_file(
             self,
             target_path: str,