Remove wasteful signal trap from transactions. Backport from 2-0-stable.

git-svn-id: http://svn-commit.rubyonrails.org/rails/branches/1-2-stable@8895 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/transactions.rb

@@ -82,7 +82,6 @@ def self.included(base)
     # Tribute: Object-level transactions are implemented by Transaction::Simple by Austin Ziegler.
     module ClassMethods
       def transaction(*objects, &block)
-        previous_handler = trap('TERM') { raise TransactionError, "Transaction aborted" }
         increment_open_transactions
 
         begin
@@ -101,7 +100,6 @@ def transaction(*objects, &block)
           raise
         ensure
           decrement_open_transactions
-          trap('TERM', previous_handler)
         end
       end