Fix vr_lib_page_alloc function
Fix vr_lib_page_alloc function

Before it was always allocating only
one page.

Change-Id: I716c7e2abd417e9b7e99da30653e3a536b0a82e6

codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter