Add handle_error to command_stream

Author: sjanusz-r7

lib/net/ssh/command_stream.rb

@@ -96,7 +96,7 @@ def initialize(ssh, cmd = nil, pty: false, cleanup: false)
         rssh.close
       end
     end
-  rescue ::Exception => e
+  rescue ::StandardError => e
     # XXX: This won't be set UNTIL there's a failure from a thread
     self.error = e
   ensure
@@ -113,6 +113,11 @@ def verify_channel
     end
   end
 
+  def handle_error(error: nil)
+    self.error = error if error
+    cleanup
+  end
+
   def cleanup
     self.monitor.kill
     self.lsock.close rescue nil