Pin plugins versions, add skip list, adjust tempest config

Change-Id: I00773be2183980fc2c49a35d1e394469354838bc
diff --git a/tempest/boot_config_none_env.yaml b/tempest/boot_config_none_env.yaml
new file mode 100644
index 0000000..259bddd
--- /dev/null
+++ b/tempest/boot_config_none_env.yaml
@@ -0,0 +1,2 @@
+resource_registry:
+  "Heat::InstallConfigAgent": "OS::Heat::SoftwareConfig"