Add an environment option to suppress info msgs

It's often you want counts of just WARN and ERROR messages, and don't
want to spam yourself with INFO messages that you don't intend to
address anyway. This is most often the case with CI, such as with

https://travis-ci.org/todb-r7/metasploit-framework

tools/msftidy.rb

@@ -11,6 +11,7 @@ require 'find'
 require 'time'
 
 CHECK_OLD_RUBIES = !!ENV['MSF_CHECK_OLD_RUBIES']
+SUPRESS_INFO_MESSAGES = !!ENV['MSF_SUPPRESS_INFO_MESSAGES']
 
 if CHECK_OLD_RUBIES
   require 'rvm'
@@ -91,6 +92,7 @@ class Msftidy
   # Display an info message. Info messages do not alter the exit status.
   #
   def info(txt, line=0)
+    return if SUPRESS_INFO_MESSAGES
     line_msg = (line>0) ? ":#{line}" : ''
     puts "#{@full_filepath}#{line_msg} - [#{'INFO'.cyan}] #{cleanup_text(txt)}"
   end