Expand test suite to cover RSA as well as ed25519

tests/00_minimal.miltertest

@@ -1,8 +1,12 @@
 -- -*- lua -*-
-mt.echo("beginning test")
-conn = mt.connect("unix:signing.sock")
-if conn == nil then
-  error "mt.connect() failed"
+for _, keytype in ipairs({"ed25519", "rsa"}) do
+   for _, func in ipairs({"signing", "verify"}) do
+      mt.echo("testing "..keytype.." "..func)
+      conn = mt.connect("unix:"..keytype.."."..func..".sock")
+      if conn == nil then
+         error("mt.connect() failed "..keytype.." "..func)
+      end
+      mt.disconnect(conn)
+      mt.echo(keytype.." "..func.." complete")
+   end
 end
-mt.disconnect(conn)
-mt.echo("test complete")