sonic-sai-vm may open wrong SQL database.

[mabnhdev]

In sai_vm_db_init(), the db_path to the DB is acquired from the SAI_DB_CONFIG_FILE. The db_path string is defined to be a constant obtained from the config file. The db_path should only be considered valid as long as the config file is open. At end of the sai_vm_db_init(), the function used db_path to open the database AFTER the config file is closed. This is a bug - you are only getting away with it on Debian because the garbage collection is not aggressive. On Ubuntu 16.04, you end up using a garbage DB name.

I suggest you move the config file close to the end of the function or, at least, after the final reference to any constant string derived from the config file.