Add support for setting indy-node log level.

[WadeBarnes]

• Have the indy-node log level follow the setting for LOG_LEVEL, which is set and can be controlled through von-network on startup.
• Examples:
  • ./manage start --logs LOG_LEVEL=debug
  • ./manage start --logs LOG_LEVEL=info
  • ./manage start --logs LOG_LEVEL=error

[WadeBarnes]

Resolves https://github.com/bcgov/von-network/issues/159