Add some tests for map_dev
Add some tests for map_dev

Ensure that nova.virt.disk.mount.api.Mount.map_dev attempts to map a
device according to the device name and partition supplied.

Change-Id: I593f153575c77b73d187c704b87ee16094a6ada6
Partial-Bug: #1428639

zhimin711/nova,cernops/nova,hanlind/nova,mikalstill/nova,openstack/nova,mahak/nova,Juniper/nova,NeCTAR-RC/nova,klmitch/nova,phenoxim/nova,dims/nova,BeyondTheClouds/nova,rahulunair/nova,vmturbo/nova,NeCTAR-RC/nova,mikalstill/nova,sebrandon1/nova,dims/nova,rajalokan/nova,jianghuaw/nova,rajalokan/nova,BeyondTheClouds/nova,cyx1231st/nova,cloudbase/nova,cyx1231st/nova,apporc/nova,CEG-FYP-OpenStack/scheduler,BeyondTheClouds/nova,cernops/nova,gooddata/openstack-nova,CEG-FYP-OpenStack/scheduler,zhimin711/nova,jianghuaw/nova,openstack/nova,gooddata/openstack-nova,sebrandon1/nova,Juniper/nova,gooddata/openstack-nova,mikalstill/nova,klmitch/nova,phenoxim/nova,cernops/nova,alaski/nova,sebrandon1/nova,jianghuaw/nova,mahak/nova,rajalokan/nova,bigswitch/nova,mahak/nova,cloudbase/nova,apporc/nova,devendermishrajio/nova,Juniper/nova,klmitch/nova,jianghuaw/nova,openstack/nova,Juniper/nova,vmturbo/nova,hanlind/nova,hanlind/nova,rahulunair/nova,klmitch/nova,gooddata/openstack-nova,rahulunair/nova,rajalokan/nova,bigswitch/nova,vmturbo/nova,alaski/nova,devendermishrajio/nova,vmturbo/nova,cloudbase/nova