[Cloudlight] QSFP-DD FW upgrade doesn't work (sonic-net#257)

- Description
Waiting a delay in "run_fw_image" to ensure it is really executed.
Return a special package when get none in "get_module_fw_info".

- Motivation and Context
"run_fw_image" will be executed after a delay which according to run cmd, waiting the delay in "run_fw_image" to avoid aother cmd sent before it really executing.
CDB cmds will maybe cause several seconds NACK or stretching on i2c bus depend on implementation of module vendor, handling this situation for compatible with different implementation.

sonic_platform_base/sonic_xcvr/api/public/cmis.py

@@ -1175,6 +1175,10 @@ def get_module_fw_info(self):
 
         # get fw info (CMD 0100h)
         rpllen, rpl_chkcode, rpl = self.cdb.get_fw_info()
+        # Interface NACK or timeout
+        if (rpllen is None) or (rpl_chkcode is None):
+            return {'status': False, 'info': "Interface fail", 'result': 0} # Return result 0 for distinguishing CDB is maybe in busy or failure.
+
         # password issue
         if self.cdb.cdb_chkcode(rpl) != rpl_chkcode:
             string = 'Get module FW info: Need to enter password\n'

sonic_platform_base/sonic_xcvr/api/public/cmisCDB.py

@@ -433,6 +433,7 @@ def run_fw_image(self, mode = 0x01):
         cmd[137-INIT_OFFSET] = mode
         cmd[138-INIT_OFFSET] = 2 # Delay to Reset 512 ms
         cmd[133-INIT_OFFSET] = self.cdb_chkcode(cmd)
+        delay = int.from_bytes(cmd[138-INIT_OFFSET:138+2-INIT_OFFSET], byteorder='big') + 50 # Add few ms on setting time.
         self.write_cdb(cmd)
         status = self.cdb1_chkstatus()
         if (status != 0x1):
@@ -444,6 +445,7 @@ def run_fw_image(self, mode = 0x01):
         else:
             txt = 'Run firmware status: Success'
         logger.info(txt)
+        time.sleep(delay/1000) # Wait "delay time" to avoid other cmd sent before "run_fw_image" start.
         return status
 
     # Commit FW image