vlib: startup multi-arch variant configuration

Support for startup node multi-arch variant selection through startup.conf.
This is to facilitate unit, functional testing and benchmarking of non-default
multi-arch variant node code path. Also added parameters to make test, to
specific using multi-arch variants in unit testing.

Type: improvement

Signed-off-by: Ray Kinsella <mdr@ashroe.eu>
Change-Id: I94fd332bb629683b7a7dd770ee9f615a9a424060
diff --git a/test/framework.py b/test/framework.py
index c21d188..1983402 100644
--- a/test/framework.py
+++ b/test/framework.py
@@ -381,6 +381,12 @@
         if not hasattr(cls, "worker_config"):
             cls.worker_config = ""
 
+        default_variant = os.getenv("VARIANT")
+        if default_variant is not None:
+            default_variant = "defaults { %s 100 }" % default_variant
+        else:
+            default_variant = ""
+
         cls.vpp_cmdline = [cls.vpp_bin, "unix",
                            "{", "nodaemon", debug_cli, "full-coredump",
                            coredump_size, "runtime-dir", cls.tempdir, "}",
@@ -391,11 +397,13 @@
                            "physmem", "{", "max-size", "32m", "}",
                            "statseg", "{", "socket-name", cls.stats_sock, "}",
                            "socksvr", "{", "socket-name", cls.api_sock, "}",
+                           "node { ", default_variant, "}",
                            "plugins",
                            "{", "plugin", "dpdk_plugin.so", "{", "disable",
                            "}", "plugin", "rdma_plugin.so", "{", "disable",
                            "}", "plugin", "unittest_plugin.so", "{", "enable",
                            "}"] + cls.extra_vpp_plugin_config + ["}", ]
+
         if cls.extra_vpp_punt_config is not None:
             cls.vpp_cmdline.extend(cls.extra_vpp_punt_config)
         if plugin_path is not None: