Fix psutil.AccessDenied on Windows

[chenseanxy]

As per #67
It seems on windows, when iterating through processes, AccessDenied would occour on start_full_node.exe when process.name().

[swar]

I'm not sure why this hasn't been reported by anyone else honestly. I'm afraid adding this in and having AccessDenied on the manager will cause some unforeseen issues.

When you have this issue, is it only on start_full_node.exe?

[chenseanxy]

Yeah it seems so (the pid that causes such problem is always start_full_node), and it happens even with elevated privilages.
This change should be safe, as the manager start process should be on the same privilage level as the manager process.

I'm on Windows Server 2019, Python 3.8, not using venv, and using out-of-the-box Adminstrator user (this is the default user for Server).

[chenseanxy]

Also, #240 and #158.

BTW solution in #158 did not solve the issue (and I don't really have a python env problem since Python 3.8 is the only python deployed)

[chenseanxy]

Also also, just to quote a psutil discussion:

Moreover: when iterating over processes you are deliberately encouraged to expect both AccessDenied and NoSuchProcess in your code and "continue" every time you incur into them because that is just how psutil is supposed be used

From here

[Dark-Sider]

I'm not sure why this hasn't been reported by anyone else honestly. I'm afraid adding this in and having AccessDenied on the manager will cause some unforeseen issues.

When you have this issue, is it only on start_full_node.exe?

I had the very same issue with a XBOX Live Bar process. On systems with many services this error is expected to occur as not every process can be access by every user!

[swar]

Good work @chenseanxy on all the research you put into this issue. Thank you.

[ggdada]

I tried to edit it, but it didn't work,this is run python manager.py view ,python manager.py start have not this problem.