Improve TBF logging

use a format in tbf::name() which is sanitized (osmo_sanitize) and hence
can be used both in regular log as well as for its internal FSM ids.
Until now, the FSMs contained a small amount of information with
different formatting than the regular LOGPTFB(), which made it difficult
to grep or follow a TBF through its lifetime looking at logs. The new
unified format makes that a lot easier.

Extra information is now printed if available, such as IMSI.
Furthermore, the TFI is updated to include BTS and TRX, since the TFI is
unique within the scope of a TRX.

Change-Id: I3ce1f53942a2f881d0adadd6e5643f5cdf6e31da
---
M src/gprs_ms.c
M src/tbf.cpp
M src/tbf.h
M tests/alloc/AllocTest.err
M tests/app_info/AppInfoTest.err
M tests/ms/MsTest.err
M tests/tbf/TbfTest.err
M tests/types/TypesTest.err
M tests/ulc/PdchUlcTest.err
9 files changed, 495,977 insertions(+), 495,954 deletions(-)