Set noparent in connectivity CTS owners

Also reorganize the files to have one toplevel CTS owners file, and only
additional owners in subdirectories.

Change-Id: I28ce193896e1ade2034589327805870774a4d608
Test: m
diff --git a/tests/cts/net/OWNERS b/tests/cts/net/OWNERS
index 7722bb3..432bd9b 100644
--- a/tests/cts/net/OWNERS
+++ b/tests/cts/net/OWNERS
@@ -1,5 +1,3 @@
 # Bug component: 31808
-lorenzo@google.com
-satk@google.com
-
+# Inherits parent owners
 per-file src/android/net/cts/NetworkWatchlistTest.java=alanstokes@google.com