ctx cleanup: use non-NULL talloc ctx for osmo_init_logging2()

Fix various sanitizer complaints about memory leaks using a sanitizer build
with gcc (Debian 7.3.0-12) 7.3.0.

Also fix deprecation warnings on osmo_init_logging().

Depends: I216837780e9405fdaec8059c63d10699c695b360 (libosmocore)
Change-Id: I970c6f8a0e36a8b63e42349dbc92baff649e5cef
11 files changed