only use ANSI ctrl chars in stdio output

the async output fix was put in the parent UI IO
class when it only really makes sense in stdio.
Those ctrl sequences will noly be understood if output to a
terminal.

MS-2298

Author: David Maloney

lib/rex/ui/text/output.rb

@@ -63,18 +63,7 @@ def print_status(msg = '')
   end
 
   def print_line(msg = '')
-    if (/mingw/ =~ RUBY_PLATFORM)
-      print(msg + "\n")
-      return
-    end
-    print("\033[s") # Save cursor position
-    print("\r\033[K" + msg + "\n")
-    if input and input.prompt
-      print("\r\033[K")
-      print(input.prompt.tr("\001\002", ''))
-      print(input.line_buffer.tr("\001\002", ''))
-      print("\033[u\033[B") # Restore cursor, move down one line
-    end
+   print(msg + "\n")
   end
 
   def print_warning(msg = '')

lib/rex/ui/text/output/stdio.rb

@@ -55,6 +55,23 @@ def io
     @io ||= $stdout
   end
 
+  # Use ANSI Control chars to reset prompt position for async output
+  # SEE https://github.com/rapid7/metasploit-framework/pull/7570
+  def print_line(msg = '')
+    if (/mingw/ =~ RUBY_PLATFORM)
+      print(msg + "\n")
+      return
+    end
+    print("\033[s") # Save cursor position
+    print("\r\033[K" + msg + "\n")
+    if input and input.prompt
+      print("\r\033[K")
+      print(input.prompt.tr("\001\002", ''))
+      print(input.line_buffer.tr("\001\002", ''))
+      print("\033[u\033[B") # Restore cursor, move down one line
+    end
+  end
+
   #
   # Prints the supplied message to standard output.
   #