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/multicloud b/bootstrap/vagrant-onap/lib/multicloud
index 1126d61..1c781fe 100755
--- a/bootstrap/vagrant-onap/lib/multicloud
+++ b/bootstrap/vagrant-onap/lib/multicloud
@@ -25,6 +25,11 @@
     done
 }
 
+# get_multicloud_images() -
+function get_multicloud_images {
+    echo "pass"
+}
+
 # install_multicloud() - 
 function install_multicloud {
     echo "pass"
@@ -38,5 +43,10 @@
             compile_multicloud_repos
         fi
     fi
-    install_multicloud
+    if [[ "$skip_get_images" == "False" ]]; then
+        get_multicloud_images
+        if [[ "$skip_install" == "False" ]]; then
+            install_multicloud
+        fi
+    fi
 }