Enhance openflow communication performance

[lfu-ps]

1. "include/libfluid-" and "src/libfluid-" are copied from https://github.com/OpenNetworkingFoundation/libfluid_base and msg, they are third party open source libraries so you can skip reviewing, btw it is Apache 2.0 license (https://github.com/OpenNetworkingFoundation/libfluid_base/blob/master/LICENSE)
2. please focus on how we leverage the libfluid fundamental, meaning the derived classes from it
3. switch to openvswitch release version dependencies (https://www.openvswitch.org/download/) instead of the git src code version
4. migrate ovs control functions to be compatible with the ovs release headers and lib
5. style enforcement can be added on later, not fully completed on every header and src file

[lfu-ps]

ACA Crashes when Processing a Large Number of GoalStates at (Almost) the Same Time
Due to the new mechanism, the issue above is fixed with the refactoring. Tested with 1000 ports successfully.

[cj-chung]

LGTM

[xieus]

A few minor comments.

[xieus]

Thank you @lfu-ps. This PR optimizes the comm layer significantly.