Add a master switch so that the sync/async mode can be configured.
Example usage of the switch:
1. Configure mode while building an image
`make ENABLE_SYNCHRONOUS_MODE=y <target>`
2. Configure when the device is running
Change CONFIG_DB with `sonic-cfggen -a '{"DEVICE_METADATA":{"localhost": {"synchronous_mode": "enable"}}}' --write-to-db`
Restart swss with `systemctl restart swss`
* merged new p4 platform from 1.0.3
* reverted SAI-P4-BM to SAI1.0
* changed port_config.ini from alias to name. changed tenjin makefile to https
* updated SAI-P4-BM commit
* [platform/p4]: Updated P4 docker to be up to date with vs.
* Merged swss, swss-common and sai-redis with master, now supports new ConfigDB.
* Changed startup script to work with supervisor for managing processes.
Signed-off-by: Yonatan Piasetzky yonatanp@mellanox.com
* Updated SAI-BM submodule to sai v1.0.4 tag. now supports hostif vlan tag for port netdev
* Updated SAI-P4-BM submodule.
