Fix some TODO's

[nkryuchkov]

Did you run make format && make check? Yes

WIP on #107
Fixes #600

Changes:

• Fix some TODO's
• Change packet logs from info to debug
• Disable stdout and stderr output while an updater progress bar is shown.

How to test this PR:

• Run make check
• Change version in Makefile to v0.1.0
• Run integration env
• Run curl -k -d '{"checksums_url":"", "archive_url":"", "channel":"testing", "version":""}' -X POST https://localhost:8000/api/visors/0348c941c5015a05c455ff238af2e57fb8f914c399aab604e9abb5b32b91a4c1fe/update to run updating
• Check VisorB logs
• Update should finish successfully and there should be no other logs while a progress bar is shown
  • The latter could be checked by running curl -k -d '{"command":"echo TEST"}' -H 'Content-Type: application/json' -X POST https://localhost:8000/api/visors/0348c941c5015a05c455ff238af2e57fb8f914c399aab604e9abb5b32b91a4c1fe/exec a few times, logs will appear after updating finishes
• After updating, a new binary should start with a hypervisor config error because the hypervisor is a separate binary in the latest release

[jdknives]

Works as expected. Good job. Probs should be tested on Linux as well.

[taras-skycoin]

Everything works allright.