change log level of "DL packet loss" log messages

The TBF tests are failing on some machines due to unexpected
log output: "DL packet loss of IMSI= / TLLI=0xffeeddcc: 0%"
These messages are printed if >= 1 second has passed between
loss reports. This timing is machine-dependent so the test
is unstable as a result. Only print these messages at log
level debug to (hopefully) make TBF tests pass consistently.
Update expected test output accordingly.

Change-Id: Ie43f0e3a8740f0fc132809a09a153886c51fadf9
diff --git a/src/gprs_rlcmac_meas.cpp b/src/gprs_rlcmac_meas.cpp
index cffdbc6..f6448d5 100644
--- a/src/gprs_rlcmac_meas.cpp
+++ b/src/gprs_rlcmac_meas.cpp
@@ -154,7 +154,7 @@
 	if (!sum)
 		return -EINVAL;
 
-	LOGP(DRLCMACMEAS, LOGL_INFO, "DL packet loss of IMSI=%s / TLLI=0x%08x: "
+	LOGP(DRLCMACMEAS, LOGL_DEBUG, "DL packet loss of IMSI=%s / TLLI=0x%08x: "
 		"%d%%\n", tbf->imsi(), tbf->tlli(),
 		tbf->m_bw.dl_loss_lost * 100 / sum);