Tidy loss of manager exception text (#1600)
Tidy loss of manager exception text (#1600)

Decode away the b'' wrapping around manager ID

Change Manager case to match other error message "Task failure due to loss of worker"

Rephrase docstring

Previously:

parsl.executors.high_throughput.interchange.ManagerLost: Task failure due to loss of Manager
b'6f2dab838843' on host parsl-dev-3-5-4032

Now:

parsl.executors.high_throughput.interchange.ManagerLost: Task failure due to loss of manager
05fc46e83367 on host parsl-dev-3-5-4032
Parsl/parsl,Parsl/parsl,Parsl/parsl,Parsl/parsl