The vswitch::provider parameter is set to 'ovs_redhat' but it results
in including the vwitch::ovs_redhat class which has never existed.
The parameter is supposed to take ovs or dpdk thus the default should
be ovs even in RedHat OS.
Change-Id: I84d023ab82c0432eeb762682d0496d6c6bbf2e82
(cherry picked from commit 961eed828c)