Start blockchain and related services before accepting external requests

[CoderZhi]

Description

External requests, e.g., block sync, action broadcast, and etc, should not be turned on before the core blockchain services are started.

Is this a hard-fork (and height to be activated)

• [] Yes
• Name of activation height:

Implementation plan

• [] Phase 1 description (PR number)
• [] Phase 2 description (PR number)
• [] Phase 3 description (PR number)

Affected modules

• [] action
• [] actpool
• [] api
• [] blockchain
• [] blockindex
• [] blocksync
• [] chainservice
• [] config
• [] consensus
• [] db
• [] dispatcher
• [] ioctl
• [] p2p
• [] server
• [] state
• [] tools

[millken]

iotex server Start data flow