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/robot b/bootstrap/vagrant-onap/lib/robot
index 34b431a..ebcca6e 100755
--- a/bootstrap/vagrant-onap/lib/robot
+++ b/bootstrap/vagrant-onap/lib/robot
@@ -59,6 +59,11 @@
             compile_robot_repos
         fi
     fi
-    get_robot_images
-    install_robot
+
+    if [[ "$skip_get_images" == "False" ]]; then
+        get_robot_images
+        if [[ "$skip_install" == "False" ]]; then
+            install_robot
+        fi
+    fi
 }