Otherwise there's too much output. With debug enabled, iperf3 test from
gprs testsuite generates a 111MB osmo-pcu.log.
Change-Id: I687361f3d6ede9a77531cd71204b1b07e0d1af42
VTY cmd "logging level all" is deprecated in favour of "logging level
set-all", but the required behaviour in this case is "logging level
set-all".
Change-Id: Ice54fca6be86f05a02ce4ae783e6e42e6958b95d