REVERTED WL#13821 REFACTORING: DEADLOCK WITH PLUGIN INSTALL

  REVERT of the following commits:
  * 41c85db65e7e7163248e6593bb159131c0fa34b8
  * 0e5c329d68a94c0adf924a366a8a4a9db0c28ab2
  * 71eba450222fb384dc48e5de776f15ca3305144a
  * a7b2c6e92d9d2d3216762624f8d2b9290cf72607
  * 0c56cdedab122971b435144aee3f7a34c0678fd8
  * e5e900757e4cf07490a82cf883cade474239a51d

  commit 41c85db65e7e7163248e6593bb159131c0fa34b8
  Author: Marc Alff <marc.alff@oracle.com>
  Date:   Fri Apr 17 03:25:08 2020 +0200

  commit 0e5c329d68a94c0adf924a366a8a4a9db0c28ab2
  Author: Marc Alff <marc.alff@oracle.com>
  Date:   Fri Apr 17 01:05:18 2020 +0200

  commit 71eba450222fb384dc48e5de776f15ca3305144a
  Author: Marc Alff <marc.alff@oracle.com>
  Date:   Thu Apr 16 23:36:33 2020 +0200

  commit a7b2c6e92d9d2d3216762624f8d2b9290cf72607
  Author: Marc Alff <marc.alff@oracle.com>
  Date:   Thu Apr 16 14:34:48 2020 +0200

  commit 0c56cdedab122971b435144aee3f7a34c0678fd8
  Author: Tor Didriksen <tor.didriksen@oracle.com>
  Date:   Thu Apr 16 09:55:19 2020 +0200

  commit e5e900757e4cf07490a82cf883cade474239a51d
  Author: Marc Alff <marc.alff@oracle.com>
  Date:   Wed Apr 15 15:14:06 2020 +0200

Reverting the fix,
due to performance regressions in connect/disconnect workloads.

Approved by: Georgi Kodinov <georgi.kodinov@oracle.com>