Increase the Priority weight for Vote and BlockPart channels

[ValarDragon]

Feature Request

Summary

We should increase the priority weight for Vote and BlockPart channels, to ensure these packets at consensus time get prioritized over mempool tx gossip.

Right now the priorities are:

• Vote: 7
• Data: 10 (Aka Blockpart)
• Mempool: 5

I suggest starting such a move by making it Vote: 40, and Data: 30. Assuming #2954 , Vote should likely be higher due to having two rounds of voting, vs data gossips one round per block, and much smaller number of block parts.

This unfortunately would increase the prioritization of catching up peers who are behind, until that is split out of the Data channel. I think thats worthwhile for increasing prioritization of consensus messages relative to the mempool