tests: multiple apidir locations

To support testing of external plugins, add support to the test framework and PAPI
for specifying a list of locations to look for api.json files.

Type: improvement
Signed-off-by: Ole Troan <ot@cisco.com>
Change-Id: I128a306e3c091dc8ef994801b1470b82d2f4595d
Signed-off-by: Ole Troan <ot@cisco.com>

test/vpp_papi_provider.py

@@ -238,7 +238,7 @@ class VppPapiProvider(object):
 
         # install_dir is a class attribute. We need to set it before
         # calling the constructor.
-        VPPApiClient.apidir = config.vpp_install_dir
+        VPPApiClient.apidir = config.extern_apidir + [config.vpp_install_dir]
 
         self.vpp = VPPApiClient(
             logger=test_class.logger,