log: update default log levels
log: update default log levels

Use global default loglevel to DEBUG(8) and dynamic default loglevel
to INFO(7).

Signed-off-by: Pavan Nikhilesh <8184a94f8f7778086ea0697cdb513b2e42813b09@caviumnetworks.com>
Reviewed-by: Olivier Matz <dfcc1510895413197abb4336e39bb0a3906cba71@6wind.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk