Refactor install_python function

It was extract the installation of pip packages from the
install_python function, this change allows to install python
packages isolated. This also includes the manual configuration
of java certificates required for maven execution.

Change-Id: Iac60d7521101d5c4997f95c16f4decd857cc5c3c
Signed-off-by: Victor Morales <victor.morales@intel.com>
diff --git a/bootstrap/vagrant-onap/lib/vfc b/bootstrap/vagrant-onap/lib/vfc
index 44e433d..5aba76f 100755
--- a/bootstrap/vagrant-onap/lib/vfc
+++ b/bootstrap/vagrant-onap/lib/vfc
@@ -17,6 +17,8 @@
 
 # compile_all_vfc_repos() - Function that compiles VF-C source repo.
 function compile_all_vfc_repos {
+    install_python_package tox
+
     pushd $src_folder/gvnfm/vnflcm/lcm
     tox -e py27
     popd