[WFLY-2741] Single process management operation timeouts
Use shared utility for managing test extension module
[WFLY-3058] Expose actively executing mgmt ops as management resources
[WFLY-3090] Prevent mgmt op cancellation resulting in closing intra-process connections
[WFLY-3091] Fix propagation of mgmt op cancellation to server update tasks
Tests of the above and of WFLY-3058
[WFLY-3058] Add convenience ops to find/cancel non-progressing ops