software/slapos-sr-testing: also disable python3.(minor)

Some configure scripts, such as cmake's FindPython3, use explicit
python version such as python3.9 and can find system python, although
using python3 would be catched by the disabled python. With this change
we also catch attempt of using python3.9

We also print the executed command, it helps guessing what executed
python

software/slapos-sr-testing/software.cfg

@@ -284,14 +284,34 @@ entry-points =
   python2=${:eggs}:ignored
   python2.7=${:eggs}:ignored
   python3=${:eggs}:ignored
+  python3.5=${:eggs}:ignored
+  python3.6=${:eggs}:ignored
+  python3.7=${:eggs}:ignored
+  python3.8=${:eggs}:ignored
+  python3.9=${:eggs}:ignored
+  python3.10=${:eggs}:ignored
+  python3.11=${:eggs}:ignored
+  python3.12=${:eggs}:ignored
+  python3.13=${:eggs}:ignored
+  python3.14=${:eggs}:ignored
 scripts =
   python
   python2
   python2.7
   python3
+  python3.5
+  python3.6
+  python3.7
+  python3.8
+  python3.9
+  python3.10
+  python3.11
+  python3.12
+  python3.13
+  python3.14
 initialization =
   import sys
-  print("Error: attempt to use system python", file=sys.stderr)
+  print("Error: attempt to use system python. Executed with: %s" % sys.argv, file=sys.stderr)
   sys.exit(2)
 
 [recurls-repository]