Middlewares sync issues

[jeffladiray]

Middlewares handling seems to be pretty flacky.

Middlewares loading from DB seems to be ok since restarting pods/server seems to repair everything, but middlewares cache update related code doesn't work.

This can cause null/empty WS call, webchat publish desync, ...

To reproduce :

• Create a new chatbot
• Add webchat and json-ws plugin
• Set json-ws with invalid parameters
• Send a few chatbot test to check that WS doesn't work
• Edit json-ws to fix parameters
• Re-send a few messages - They will not trigger the WS

[mikbry]

Remove middlewares cache ?