Improve custom error tracebacks and messages (#1992)

Removal of duplicated `psutil.NoSuchProcess` text. Before:

```
psutil.NoSuchProcess: psutil.NoSuchProcess process no longer exists (pid=4651, name="python")
psutil.ZombieProcess: psutil.ZombieProcess process no longer exists and it's a zombie (pid=4651, name="python")
psutil.AccessDenied: psutil.AccessDenied (pid=4651, name="python")
psutil.TimeoutExpired: psutil.TimeoutExpired timeout after 5 seconds (pid=4651, name="python")
```

Now:

```
psutil.NoSuchProcess: process no longer exists (pid=4651, name="python")
psutil.ZombieProcess: process no longer exists and it's a zombie (pid=4651, name="python")
psutil.AccessDenied: (pid=4651, name="python")
psutil.TimeoutExpired: timeout after 5 seconds (pid=4651, name="python")

```
---

More info if process PID has been reused: Before:

```
psutil.NoSuchProcess: psutil.NoSuchProcess process no longer exists (pid=465148)
```

Now:

```
psutil.NoSuchProcess: process no longer exists and its PID has been reused (pid=465148)
```

---

Before:

```
psutil.NoSuchProcess: psutil.NoSuchProcess no process found with pid 666
```

Now:

```
psutil.NoSuchProcess: process PID not found (pid=666)
```

--- 

Before:

```
>>> psutil.NoSuchProcess(212, name="python")
psutil.NoSuchProcess process no longer exists (pid=212, name='python')
```

Now:

```
>>> psutil.NoSuchProcess(212, name="python")
psutil.NoSuchProcess(pid=212, name='python', msg='process no longer exists')
```

0 files changed, 0 insertions, 0 deletions