Relax apilint FW1 error to a warning

This rule was catching simple getters ("getIntent") as errors even if
the method is a true property get method. Relax to warning until we
can make this a bit more clever.

Change-Id: If183ad5bdc076ce2252399d4abcc8a3a6cbb55c3
diff --git a/tools/apilint/apilint.py b/tools/apilint/apilint.py
index 72ee343..df76bc9 100644
--- a/tools/apilint/apilint.py
+++ b/tools/apilint/apilint.py
@@ -518,7 +518,7 @@
             if m.name.startswith("create") and m.name.endswith("Intent"):
                 pass
             else:
-                error(clazz, m, "FW1", "Methods creating an Intent must be named createFooIntent()")
+                warn(clazz, m, "FW1", "Methods creating an Intent should be named createFooIntent()")
 
 
 def verify_helper_classes(clazz):