[Submodule update] sonic-utilities with PR's:

abdosi · tiantianlv · commit f7aca5ce67de · 2020-04-24T09:26:18.000+08:00
[201911] Explicitly specify command names with underscores (continued) (sonic-net#868) [fwutil]: Update Command-Reference.md. (sonic-net#876)
diff --git a/src/sonic-utilities b/src/sonic-utilities
@@ -1 +1 @@
-Subproject commit 8f08a1550afbfab1706bd3ec347795b36e367ed2
+Subproject commit 250a49bf47e24b2b5aa5f84478cbe8550f817589
