Add Python Version Check to Python Scripts

ISSUE #204 : Running on versions prior to 3.10 will fail, due to
the use of `match` statements. Other parts of the script assume
a recent Python also, and the system as a whole expects a recent
version of Ubuntu.

`pythonCheck.py` polls `sys.version_info` to detect the in-use
version of Python. If the version is prior to 3.10, it bails out
with the message "LibreQoS requires Python 3.10 or greater".

This should help with outdated OS detection in general.

src/LibreQoS.py

@@ -1,5 +1,6 @@
 #!/usr/bin/python3
-
+from pythonCheck import checkPythonVersion
+checkPythonVersion()
 import csv
 import io
 import ipaddress

src/integrationSplynx.py

@@ -1,3 +1,5 @@
+from pythonCheck import checkPythonVersion
+checkPythonVersion()
 import requests
 from ispConfig import excludeSites, findIPv6usingMikrotik, bandwidthOverheadFactor, exceptionCPEs, splynx_api_key, splynx_api_secret, splynx_api_url
 from integrationCommon import isIpv4Permitted

src/integrationUISP.py

@@ -1,3 +1,5 @@
+from pythonCheck import checkPythonVersion
+checkPythonVersion()
 import requests
 import os
 import csv

src/pythonCheck.py

@@ -0,0 +1,14 @@
+import os
+
+def checkPythonVersion():
+    # Perform a version check
+    import sys
+    print("Running Python Version " + sys.version)
+    version_ok = True
+    if sys.version_info[0] < 3:
+        version_ok = False
+    if sys.version_info[0]==3 and sys.version_info[1] < 10:
+        version_ok = False
+    if version_ok == False:
+        print("LibreQoS requires Python 3.10 or greater.")
+        os._exit(-1)