4.0.1 Patches,

What does this MR do and why?

• Remove no-else-* pylint exemptions and tidy code.
  
• Make unRAID more readable, and flatten path to lower, to fit standard practice
  
• Fix support log deletion race issue, where logs would be deleted before download
  
• Flatten all instances of username creation or editing, usernames should be lower case.
  
• Fix Java Pathing issues on windows, crafty would loose process as JRE would exec itself into a new PID
  because the excecution path java would not match the full path in registry.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• Have you checked this doesn't interfere/conflict/duplicate someone elses work?
• Have you fully tested your changes?
• Have you resolved any lint issues?
• Have you assigned a reviewer?
• Have you applied correct labels?

app/classes/shared/helpers.py

 import contextlib
 import os
 import re
+import winreg
 import sys
 import json
 import tempfile
@@ -101,6 +102,39 @@ class Helpers:
     def get_servers_root_dir(self):
         return self.servers_dir
 
+    @staticmethod
+    def which_java():
+        # Adapted from LeeKamentsky's https://github.com/LeeKamentsky/python-javabridge/blob/master/javabridge/locate.py
+        jdk_key_paths = (
+            "SOFTWARE\\JavaSoft\\JDK",
+            "SOFTWARE\\JavaSoft\\Java Development Kit",
+        )
+        for jdk_key_path in jdk_key_paths:
+            try:
+                with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, jdk_key_path) as kjdk:
+                    kjdk_values = dict(
+                        [
+                            winreg.EnumValue(kjdk, i)[:2]
+                            for i in range(winreg.QueryInfoKey(kjdk)[1])
+                        ]
+                    )
+                    current_version = kjdk_values["CurrentVersion"]
+                    kjdk_current = winreg.OpenKey(
+                        winreg.HKEY_LOCAL_MACHINE, jdk_key_path + "\\" + current_version
+                    )
+                    kjdk_current_values = dict(
+                        [
+                            winreg.EnumValue(kjdk_current, i)[:2]
+                            for i in range(winreg.QueryInfoKey(kjdk_current)[1])
+                        ]
+                    )
+                    return kjdk_current_values["JavaHome"]
+            except WindowsError as e:
+                if e.errno == 2:
+                    continue
+                else:
+                    raise
+
     @staticmethod
     def check_internet():
         try: