added script to set alternatives for python

linux/system/python-alternatives.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+for python in /usr/bin/python*; do
+    if [[ $(basename $python) =~ ^python[0-9][.][0-9]$ ]]; then
+        sudo update-alternatives --install /usr/bin/python python $python 1
+    fi
+done
+
+sudo update-alternatives --config python