PCU_Tests_NS: Fix our expectations regarding CellID presence/absence

This is required by the spec, and implemented libosmocore since
Change-Id Ie87820537d6d616da4fd4bbf73eab06e28fda5e1

So let's change our test expectations.  Meanwhile, introduce
mp_tolerate_bvc_reset_cellid for working around the bug in 'latest'.

Change-Id: Icebee25b53fef623db6ae91ca0d943e70a3c86b7
2 files changed