Bug&Enhance: CMD Database Init

[andy-shi88]

Description

CMD was started as core developers support tools, so that we can test the blockchain easily, including:

• generating fake blocks
• generate and post transaction
• generate account, and etc.

Recently we started to adjust cmd tools so that the wallet or possibly other team can also use the binary of the cli tools to help development, for instance: [generate multisig account, validating the transaction bytes they've built without posting to node (this is usefull when dev nodes are down), etc].

Therefore the design of cmd need some tweaks, which is to avoid initiating database file when not needed.

Current design initialize database file whenever the binary is run, no matter what command we are running.

Breakdown

• move database initialization only to where it's needed.