support setting argv from config files

docs/example.conf

@@ -1,3 +1,10 @@
+# append some arguments to the commandline;
+# the first space in a line counts as a separator,
+# any additional spaces are part of the value
+-e2dsa
+-e2ts
+-i 127.0.0.1
+
 # create users:
 # u username:password
 u ed:123