With NovaNfsEnabled instance create fails due to wrong default
secontext. The default in THT is set to nova_var_lib_t in
Ie4fe217bd119b638f42c682d21572547f02f17b2 while
system_u:object_r:nfs_t:s0 should have access. The virt_use_nfs
boolean, which is turned on by openstack-selinux, should cover
this use case.
This changes the default to context=system_u:object_r:nfs_t:s0
Change-Id: I2a28462b6f6bc9f8a41a81ea8c65471f05df3b85
Closes-Bug: 1781894