mongodb modules want bind_ip to be a list
mongodb modules want bind_ip to be a list

The mongodb puppet module expects bind_ip to be a list.  This is a small
patch to make that true in mongodb.pp.

Change-Id: Ia93f8489d7e49085506e2125a77fe2395126674b
Closes-bug: 1297984

mahak/packstack,xbezdick/packstack,stackforge/packstack,mahak/packstack,palmer159/openstack-test,fr34k8/packstack,imcsk8/packstack,openstack/packstack,xbezdick/packstack,fr34k8/packstack,imcsk8/packstack,stackforge/packstack,palmer159/openstack-test,mahak/packstack,openstack/packstack,fr34k8/packstack,imcsk8/packstack,stackforge/packstack,xbezdick/packstack,palmer159/openstack-test,openstack/packstack