Alter logging semantics for VPP PAPI object

Restore parts of commit d0e812f wiped out by a7564e80

The full description of the change is in d0e812f

Change-Id: I632476cb10678a725396462f90f9b0bea9e572fa
Signed-off-by: Igor Mikhailov (imichail) <imichail@cisco.com>
diff --git a/src/vpp-api/python/vpp_papi/vpp_papi.py b/src/vpp-api/python/vpp_papi/vpp_papi.py
index 2310cd1..8139cf3 100644
--- a/src/vpp-api/python/vpp_papi/vpp_papi.py
+++ b/src/vpp-api/python/vpp_papi/vpp_papi.py
@@ -139,7 +139,7 @@
                 self.logger.error('Not implemented error for {}'.format(m[0]))
 
     def __init__(self, apifiles=None, testmode=False, async_thread=True,
-                 logger=logging.getLogger('vpp_papi'), loglevel='debug',
+                 logger=None, loglevel=None,
                  read_timeout=5, use_socket=False,
                  server_address='/run/vpp-api.sock'):
         """Create a VPP API object.