Add a rabbit.license_line default

so that products that build on top could adjust
what's printed in the standard banner.

References #12390

(cherry picked from commit 1f98ab6)
(cherry picked from commit 9c6db87)

Author: michaelklishin

deps/rabbit/BUILD.bazel

@@ -142,13 +142,10 @@ _APP_ENV = """[
         {credentials_obfuscation_fallback_secret, <<"nocookie">>},
         {dead_letter_worker_consumer_prefetch, 32},
         {dead_letter_worker_publisher_confirm_timeout, 180000},
-
-        %% EOL date for the current release series, if known/announced
-		{release_series_eol_date, none},
-
 		{vhost_process_reconciliation_run_interval, 30},
         %% for testing
-        {vhost_process_reconciliation_enabled, true}
+        {vhost_process_reconciliation_enabled, true},
+        {license_line, "Licensed under the MPL 2.0. Website: https://rabbitmq.com"}
 	  ]
 """
 

deps/rabbit/Makefile

@@ -125,11 +125,10 @@ define PROJECT_ENV
 		{credentials_obfuscation_fallback_secret, <<"nocookie">>},
       	{dead_letter_worker_consumer_prefetch, 32},
       	{dead_letter_worker_publisher_confirm_timeout, 180000},
-		%% EOL date for the current release series, if known/announced
-		{release_series_eol_date, none},
 		{vhost_process_reconciliation_run_interval, 30},
 		%% for testing
-		{vhost_process_reconciliation_enabled, true}
+		{vhost_process_reconciliation_enabled, true},
+		{license_line, "Licensed under the MPL 2.0. Website: https://rabbitmq.com"}
 	  ]
 endef