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/tests/_test_base b/bootstrap/vagrant-onap/tests/_test_base
index 7d0415a..78c7f8b 100644
--- a/bootstrap/vagrant-onap/tests/_test_base
+++ b/bootstrap/vagrant-onap/tests/_test_base
@@ -1,11 +1,13 @@
 #!/bin/bash
 
 source /var/onap_tests/asserts
+source /var/onap/commons
 
 # main() - Starting point for Unit Tests
 function main {
     local covered_functions=("$@")
 
+    update_repos
     len=${#covered_functions[@]}
     echo "1..$len"
     for i in ${!covered_functions[@]}; do