Fix small issues in utils

This PR contains some small fixes in utils placed under bin directory:

Fixed typo in the parsing of --color argument of color util
Fixed parsing of deprecated argument --component of hub-show after new syntax was introduced
Added possibility to set new dns-bubble endpoint by defining envvar HUB_BASE_DOMAIN (HUB_PARENT_DOMAIN is renamed to HUB_BASE_DOMAIN)

epam / hub-extensions