Add pid host support
Tested using global-net-plugin-ipc which sets PidHost in config.json.
Plugins might need access to host pid namespace. Add support for that.
Tested using aragunathan/global-net-plugin-ipc which sets "pidhost" in
config.json. Observed using `readlink /proc/self/ns/pid` that plugin and
host have the same ns.
@@ -117,6 +117,8 @@ Config provides the base accessible fields for working with V0 plugin format
- **`ipchost`** *boolean*
Access to host ipc namespace.
+- **`pidhost`** *boolean*
+ Access to host pid namespace.
- **`propagatedMount`** *string*
