prefer reading directly with MetasploitPayloads where possible

modules/exploits/multi/http/axis2_deployer.rb

@@ -98,10 +98,7 @@ class Metasploit3 < Msf::Exploit::Remote
 
       # We need this class as a wrapper to run in a thread.  For some reason
       # the Payload class is giving illegal access exceptions without it.
-      path = MetasploitPayloads.path("java", "metasploit", "PayloadServlet.class")
-      fd = File.open(path, "rb")
-      servlet = fd.read(fd.stat.size)
-      fd.close
+      servlet = MetasploitPayloads.read("java", "metasploit", "PayloadServlet.class")
       zip.add_file("metasploit/PayloadServlet.class", servlet)
 
       contents = zip.pack