Use apps_shutdown() in all applications, in case someone decides not
to go the monolith way (does anyone do that these days?).

NOTE: a few applications are missing in this commit.  I've a few more
changes in them that I haven't tested yet.
diff --git a/apps/s_server.c b/apps/s_server.c
index 11971cb..6ed2349 100644
--- a/apps/s_server.c
+++ b/apps/s_server.c
@@ -799,6 +799,7 @@
 		BIO_free(bio_s_out);
 		bio_s_out=NULL;
 		}
+	apps_shutdown();
 	EXIT(ret);
 	}