Reduce the number of update_repo calls

The update_repo function allows to fetch repository metadata. This
function can take some time during the initial provisioning time.
This change reduce the number of calls to that function.

Change-Id: I2a0b0f13f7a3e6b37f0c0316ae9730a3ed840238
Signed-off-by: Victor Morales <victor.morales@intel.com>
Issue-Id: INT-324
diff --git a/bootstrap/vagrant-onap/vagrant_utils/postinstall.sh b/bootstrap/vagrant-onap/vagrant_utils/postinstall.sh
index 7083f3d..748d1b5 100755
--- a/bootstrap/vagrant-onap/vagrant_utils/postinstall.sh
+++ b/bootstrap/vagrant-onap/vagrant_utils/postinstall.sh
@@ -6,6 +6,7 @@
 
 source /var/onap/functions
 
+update_repos
 create_configuration_files
 install_dev_tools
 configure_bind