chasquid: Load and resolve aliases

This patch integrates the aliases resolution into the daemon and queue.

The queue now will resolve aliases at Put time.

test/t-04-aliases/config/chasquid.conf

@@ -0,0 +1,11 @@
+smtp_address: ":1025"
+submission_address: ":1587"
+monitoring_address: ":1099"
+
+mail_delivery_agent_bin: "test-mda"
+mail_delivery_agent_args: "%user%@%domain%"
+
+data_dir: "../.data"
+
+suffix_separators: "+-"
+drop_characters: "._"