Add support to configuration values

In order to make more flexible the execution workflow of this
project, a new mechanism has been implemented to override the
default configuration values.

Change-Id: Ie6c5aeeb35b7f0de47379ea764ccc8dc21e4bff7
Signed-off-by: Victor Morales <victor.morales@intel.com>
Issue-Id: INT-236
diff --git a/bootstrap/vagrant-onap/lib/mr b/bootstrap/vagrant-onap/lib/mr
index a137f73..f221817 100755
--- a/bootstrap/vagrant-onap/lib/mr
+++ b/bootstrap/vagrant-onap/lib/mr
@@ -31,6 +31,10 @@
     if [[ "$clone_repo" == "True" ]]; then
         clone_mr_repos
     fi
-    get_mr_images
-    install_message_router
+    if [[ "$skip_get_images" == "False" ]]; then
+        get_mr_images
+        if [[ "$skip_install" == "False" ]]; then
+            install_message_router
+        fi
+    fi
 }