Only calculate thread UUIDs if they are needed

MSP-11147

Only calculate thread UUIDs if the thread count exceeds
EXPECTED_THREAD_COUNT_AROUND_SUITE.

Author: limhoff-r7

lib/metasploit/framework/spec/threads/suite.rb

@@ -69,11 +69,6 @@ def self.configure!
                   end
 
                   thread_list = Metasploit::Framework::Spec::Threads::Suite.non_debugger_thread_list
-
-                  thread_uuids = thread_list.map { |thread|
-                    thread[Metasploit::Framework::Spec::Threads::Suite::UUID_THREAD_LOCAL_VARIABLE]
-                  }.compact
-
                   thread_count = thread_list.count
 
                   if thread_count > EXPECTED_THREAD_COUNT_AROUND_SUITE
@@ -82,6 +77,10 @@ def self.configure!
                     if LOG_PATHNAME.exist?
                       caller_by_thread_uuid = Metasploit::Framework::Spec::Threads::Suite.caller_by_thread_uuid
 
+                      thread_uuids = thread_list.map { |thread|
+                        thread[Metasploit::Framework::Spec::Threads::Suite::UUID_THREAD_LOCAL_VARIABLE]
+                      }.compact
+
                       thread_uuids.each do |thread_uuid|
                         caller = caller_by_thread_uuid[thread_uuid]