CI: Don't test against RMS environments

The script that enables the RMS environment currently enables Komodo
stable by default and has some subtleties that we should probably
address before testing against it in this way.

ci/testkomodo.sh

@@ -26,12 +26,6 @@ start_tests () {
     pushd $CI_TEST_ROOT
     echo "Testing xtgeo against Komodo"
     install_and_test
-
-    set -e
-    for version in ${RMS_VERSIONS[@]}; do
-        # Subshell each version for sourcing roxenv
-        $(test_in_roxenv $version)
-    done
     popd
 }
 
@@ -62,6 +56,7 @@ test_in_roxenv () {
 
     python -m venv roxenv --system-site-packages
     source roxenv/bin/activate
+    pip install -U pip
 
     echo "Testing xtgeo against RMS $1"
     install_and_test