(replicator) Fix sys.path after using the module_needed function

In the module_needed function we alter the path of the python modules.
To be sure that we have no side effect, we revert this modification on
the end of the function

(cherry picked from commit ee7e771)

pulse_xmpp_agent/replicator.py

@@ -280,6 +280,7 @@ def prepare_folder_rollback(rollback_pulse_xmpp_agent, agent_folder):
 
 
 def module_needed(agent_image, verbose=False):
+    original_sys_path = sys.path.copy()
     # sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__))))
     # create file __init.py si non exist
     boolfichier = False
@@ -316,6 +317,7 @@ def module_needed(agent_image, verbose=False):
         except BaseException:
             print("Error while deleting file __init__.py")
     if error:
+        sys.path = original_sys_path
         return False
 
     for filename in [
@@ -330,7 +332,9 @@ def module_needed(agent_image, verbose=False):
                 print(
                     f"Some python modules needed for running lib/{filename} are missing. We will not switch to new agent"
                 )
+            sys.path = original_sys_path
             return False
+    sys.path = original_sys_path
     return True