Implement the zeek_init handler.

Implements the change and a test.

scripts/base/utils/exec.bro

@@ -186,7 +186,7 @@ function run(cmd: Command): Result
 		}
 	}
 
-event bro_done()
+event zeek_done()
 	{
 	# We are punting here and just deleting any unprocessed files.
 	for ( uid in pending_files )

scripts/base/utils/site.bro

@@ -148,7 +148,7 @@ function get_emails(a: addr): string
 	return fmt_email_string(find_all_emails(a));
 	}
 
-event bro_init() &priority=10
+event zeek_init() &priority=10
 	{
 	# Double backslashes are needed due to string parsing.
 	local_dns_suffix_regex = set_to_regex(local_zones, "(^\\.?|\\.)(~~)$");