Add an option for always synchronizing status

This patch adds an option for always synchronizing operational status
on a show operation; regardless of the synchronization thread, when
this option is enabled, the resource status is always fetched from
the backend.

The patch also fixes an issue observed when running test_nvp_sync
alone.

Bug #1229149
Bug #1229243

Change-Id: Ifef52ac1c48e32f413d51fc04fd926073335665d
Merge "Add an option for always synchronizing status"