Few modifications in section 2 and 3.

git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5043 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
conpaas: add IPOP section to the Installation Guide


git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5044 ef35cc4a-2640-4bbf-98bc-65920db7d8ae