Refactor install_docker_compose function

Usually this function is followed by a run command, this change
ensure that docker-compose program is installed before its execution

Change-Id: Ic68616a1db1e3c5bee516985c74f369a956d6775
Signed-off-by: Victor Morales <victor.morales@intel.com>
Issue-ID: INT-436
diff --git a/bootstrap/vagrant-onap/lib/policy b/bootstrap/vagrant-onap/lib/policy
index 0dac14d..1e633be 100755
--- a/bootstrap/vagrant-onap/lib/policy
+++ b/bootstrap/vagrant-onap/lib/policy
@@ -31,8 +31,7 @@
     pushd ${src_folders[policy]}/docker
     chmod +x config/drools/drools-tweaks.sh
     echo $IP_ADDRESS > config/pe/ip_addr.txt
-    install_docker_compose
-    /opt/docker/docker-compose up -d
+    run_docker_compose .
     popd
 }