api: api socket respect unix runtime directory

socksvr {} should respect the unix runtime directory.
Default is now /run/vpp/api.sock
The 'default' keyword is deprecated.
The user is responsible for creating directories outside of the
unix runtime directory.

Not yet done: Exit VPP when socket cannot be opened.
              (currently only process exits).

Type: fix
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: I6dd66ed58a3d7e02674dfa16d72c1d7bba07b79e
diff --git a/src/vpp-api/python/vpp_papi/vpp_papi.py b/src/vpp-api/python/vpp_papi/vpp_papi.py
index a4523b4..818a55f 100644
--- a/src/vpp-api/python/vpp_papi/vpp_papi.py
+++ b/src/vpp-api/python/vpp_papi/vpp_papi.py
@@ -191,7 +191,7 @@
     def __init__(self, apifiles=None, testmode=False, async_thread=True,
                  logger=None, loglevel=None,
                  read_timeout=5, use_socket=False,
-                 server_address='/run/vpp-api.sock'):
+                 server_address='/run/vpp/api.sock'):
         """Create a VPP API object.
 
         apifiles is a list of files containing API