control: remove contrived get_default_namespace

This use of get_default_namespace relies on the brittle idea that get_pods will always use
get_default_namespace. Currently, get_pods currently does, in fact, use get_default_namespace.
However, I don't like that we use get_default_namespace out of band relative to get_pods. I'd prefer
that we do not mention namespaces at all in our message to users unless we can prove it.

Author: mplsgrant

src/warnet/control.py

@@ -268,11 +268,11 @@ def _logs(pod_name: str, follow: bool):
             pods = get_pods()
             pod_list = [item.metadata.name for item in pods.items]
         except Exception as e:
-            print(f"Could not fetch any pods in namespace {namespace}: {e}")
+            print(f"Could not fetch any pods: {e}")
             return
 
         if not pod_list:
-            print(f"Could not fetch any pods in namespace {namespace}")
+            print("Could not fetch any pods")
             return
 
         q = [