unittest: use common_setup / common_shutdown almost everywhere.

Avoids much cut & paste.  Some tests don't need any of it, but most
want at least some of this infrastructure.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

common/test/run-json_remove.c

@@ -2,6 +2,7 @@
 #include <common/amount.h>
 #include <common/utils.h>
 #include <common/json.c>
+#include <common/setup.h>
 #include <wire/wire.h>
 
 /* AUTOGENERATED MOCKS START */
@@ -264,10 +265,9 @@ static void remove_inside_obj(void)
 		  "4", "four", NULL);
 }
 
-int main(void)
+int main(int argc, char *argv[])
 {
-	setup_locale();
-	setup_tmpctx();
+	common_setup(argv[0]);
 
 	sanity();
 	remove_one();
@@ -278,6 +278,6 @@ int main(void)
 	remove_complex();
 	remove_inside_obj();
 
-	tal_free(tmpctx);
 	printf("run-json_remove ok\n");
+	common_shutdown();
 }