[OE-core] [PATCH 09/17] wic: implement --vars option

This option is used to point wic to the directory with .env files containing list of bitbake variables and their values. If this option is used wic will get bitbake variables from files instead of parsing 'bitbake -e' output. The main reason for this is to support new mode, when bitbake runs wic

[OE-core] [PATCH 09/17] wic: implement --vars option

This option is used to point wic to the directory with .env files containing list of bitbake variables and their values. If this option is used wic will get bitbake variables from files instead of parsing 'bitbake -e' output. The main reason for this is to support new mode, when bitbake runs wic