[warmboot] Add workaround for INIT_VIEW failure (#1252)

why change is needed
"SaiGetHardwareInfo" is now returning string "none" instead of empty string (""), which is causing INIT_VIEW failure:

May 26 18:57:33.577868 NOTICE syncd#syncd: :- onSwitchCreateInInitViewMode: new switch oid:0x21000000000000 contains hardware info: ''
May 26 18:57:33.577868 ERR syncd#syncd: :- onSwitchCreateInInitViewMode: hardware info mismatch: current 'none' vs new ''
May 26 18:57:33.578017 ERR syncd#syncd: :- run: Runtime error: :- onSwitchCreateInInitViewMode: hardware info mismatch: current 'none' vs new ''
Adding this change as a temp workaround before CSP is resolved with BRCM.

how I verify
Test syncd build on lab device, able to pass INIT_VIEW stage.

sign-off: Jing Zhang [email protected]

Author: zjswhhh

syncd/Syncd.cpp

@@ -4309,6 +4309,13 @@ void Syncd::onSwitchCreateInInitViewMode(
                 sai_serialize_object_id(switchVid).c_str(),
                 newHw.c_str());
 
+        /*
+         * The line below is added due to a behavior change of SAI call.
+         *
+         * TODO: remove the line when SAI vendor agrees fix on their end.
+         */
+        currentHw = currentHw == "none"? "" : currentHw;
+
         if (currentHw != newHw)
         {
             SWSS_LOG_THROW("hardware info mismatch: current '%s' vs new '%s'", currentHw.c_str(), newHw.c_str());