[BUG] Interrupt signal ignored after cosmwasm initialization

[hanjukim]

Describe the bug
After cosmwasm intiailization when the process receives a SIGINT signal (by pressing Ctrl+C), terrad will not receive the signal. If we trigger another signal. Program will be aborted with long stack trace from wasmd.

To Reproduce

1. Start terrad.
2. Interact cosmwasm by CLI or something.
3. Press Ctrl+C in terrad process (or send signal by kill -SIGINT ) and nothing happens.
4. Press Ctrl+C again to terminate process.

Context & versions
terrad >= v0.4.0-rc.0

(if applicable) suggested solution
Solution: wasmerio/wasmer@master...hanjukim:interrupt-signal-propagation
Discussion with Cosmwasm team: CosmWasm/wasmd#4

We will have to update wasmer-runtime-core > cosmwasm-vm > go-cosmwasm