Optim module and add doc

Author: Erik Lenoir

documentation/modules/post/multi/gather/maven_creds.md

@@ -5,8 +5,8 @@ This module seeks all settings.xml (Maven configuration file) on the target file
 
 This module was successfully tested against:
 
-- Ubuntu 14.04 and Maven 3.0.5
-- Debian 9 and Maven 3.0.5
+- Ubuntu 14.04 and Maven 3.0.5 with shell and meterpreter as session type
+- Debian 9 and Maven 3.0.5 with shell and meterpreter as session type
 
 ## Verification Steps
 

modules/post/multi/gather/maven_creds.rb

@@ -55,15 +55,13 @@ def gatherwin
   def run
     print_status("Finding user directories")
     files = ""
-    if sysinfo
-      if sysinfo['OS'].include? "Windows"
+    case session.platform
+      when 'windows'
         files = gatherwin
-      else
+      when 'unix', 'linux', 'bsd', 'osx'
         files = gathernix
-      end
-    else
-       printerror("Incompatible session type, sysinfo is not available.")
-       return
+      else
+        print_error("Incompatible platform.")
     end
     if files.nil? || files.empty?
       print_error("No settings.xml file found")