Fix permission for vpp_papi

The permission for the top-level vpp_papi dir under
/usr/lib/python2.7/site-packages is set to 644 which means that
non-root users cannot import vpp_papi. As a result, devstack setup
with VPP/networking-vpp fails since it is run as non-root user.

Change-Id: Id85b468b2dcc92efb3a64c51ffb23ef6d596e4ad
Signed-off-by: Onong Tayeng <otayeng@cisco.com>
diff --git a/extras/rpm/vpp.spec b/extras/rpm/vpp.spec
index cd90a27..bf2d83a 100644
--- a/extras/rpm/vpp.spec
+++ b/extras/rpm/vpp.spec
@@ -392,7 +392,7 @@
 /usr/share/java/*
 
 %files api-python
-%defattr(644,root,root)
+%defattr(644,root,root,755)
 %{python2_sitelib}/vpp_*
 
 %files selinux-policy