Make python version pick less depended on what is installed

Sanity/basic-functions-check/runtest.sh

@@ -48,12 +48,16 @@ sqlUser() {
         rlRun "echo \"$SQLUSER_Q\" | mysql -u $TESTUSER -p$TESTPASS $TESTDB" $EXIT_CODE
 }
 
-for p in python3 python2 /usr/libexec/platform-python; do
-    if command -v $p; then
-        export PYTHON=$p
-        break
-    fi
-done
+if rlIsRHEL "<8" ; then
+    PYTHON=python2
+else
+    for p in python3 python2 /usr/libexec/platform-python; do
+        if command -v $p; then
+            export PYTHON=$p
+            break
+        fi
+    done
+fi
 
 rlJournalStart
     rlPhaseStartSetup