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/vfc b/bootstrap/vagrant-onap/lib/vfc
index a879448..5cf0ed1 100755
--- a/bootstrap/vagrant-onap/lib/vfc
+++ b/bootstrap/vagrant-onap/lib/vfc
@@ -106,6 +106,10 @@
         fi
     fi
 
-    get_vfc_images
-    install_vfc
+    if [[ "$skip_get_images" == "False" ]]; then
+        get_vfc_images
+        if [[ "$skip_install" == "False" ]]; then
+            install_vfc
+        fi
+    fi
 }