Changes

bts: limit stderr logging to ERROR to avoid long write() to ext4 fs

Commit c3ab9ec33f37c6837fb8bcb0fa0bbd2e98781fb7 already decreased
verbosity to NOTICE, but that's not enough since we still get plenty of
logging and hence plenty of long write()s during test execution.

Let's try decreasing to ERROR and see if that's enough for now to
stabilize the tests.

Change-Id: I41982fd83a9f46609464afb6b7242240063d4d91

hnbgw: expected-results.xml: Add missing TC_sccp_cr_limit

Change-Id: I4138cff311f82358f040290f3af483df8facc4cf

bts: as_rsl_meas_res(): tolerate bad RxQual in early reports

Bit errors are expected during early stage of channel establishment.
Ignore bad RxQual in the very first reports (4 * 0.480s = 1.92s).

This reduces probability of sporadic failures.

Change-Id: Ie8acb15b66cd92092ec49bc8caeaf0ad4d471f1d
Related: OS#6933

bts: as_rsl_meas_res(): do not expect dummy UL SACCH

We're now populating the UL SACCH cache before establishing a
decicated channel in f_est_dchan(), so this special case is
no longer needed and can be safely removed.

Change-Id: I6eeee2876a76d41ab453af4c7724173fea773b83
Related: I4781fe7539e64e77d594e84f905646c127f46b64
Related: OS#6933