Revert "HADOOP-12749. Create a threadpoolexecutor that overrides afterExecute to log uncaught exceptions/errors. Contributed by Sidharta Seethana."

This reverts commit f3bbe0bd020b9efe05d5918ad042d9d4d4b1ca57.

(cherry picked from commit af218101e50de0260ab74e5d2f96227a0541e121)

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -35,9 +35,6 @@ Release 2.9.0 - UNRELEASED
     HADOOP-12662. The build should fail if a -Dbundle option fails (Kai Zheng
     via cmccabe)
 
-    HADOOP-12749. Create a threadpoolexecutor that overrides afterExecute to
-    log uncaught exceptions/errors. (Sidharta Seethana via vvasudev)
-
   BUG FIXES
 
     HADOOP-12605. Fix intermittent failure of TestIPC.testIpcWithReaderQueuing