Remove pub declarations and move to posix::*

This is in order to prepare also for SysV message queues.

src/posix/info.rs

@@ -0,0 +1,24 @@
+use anyhow::Result;
+use clap::Clap;
+use posixmq::PosixMq;
+
+/// Print information about an existing message queue
+#[derive(Clap, Debug)]
+pub struct Info {
+    /// Name of the queue
+    #[clap(value_name = "QUEUE")]
+    pub queue: String,
+}
+
+impl Info {
+    pub fn run(&self) -> Result<()> {
+        let attrs = PosixMq::open(&self.queue)?.attributes()?;
+
+        println!(
+            "Message queue: {}, msg_max: {}, msgsize_max: {}, current_messages: {}",
+            &self.queue, &attrs.capacity, &attrs.max_msg_len, &attrs.current_messages
+        );
+
+        Ok(())
+    }
+}