patman: Add a 'test' subcommand

At present we use --test to indicate that tests should be run. It is
better to use a subcommand for list, like binman. Change it and adjust
the existing code to fit under a 'send' subcommand, the default.

Give this subcommand the same default arguments as the others.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/test/run b/test/run
index 27331a8..de87e75 100755
--- a/test/run
+++ b/test/run
@@ -48,7 +48,7 @@
 TOOLS_DIR=build-sandbox_spl/tools
 
 run_test "binman" ./tools/binman/binman --toolpath ${TOOLS_DIR} test
-run_test "patman" ./tools/patman/patman --test
+run_test "patman" ./tools/patman/patman test
 
 run_test "buildman" ./tools/buildman/buildman -t ${skip}
 run_test "fdt" ./tools/dtoc/test_fdt -t