[BUGFIX] Bugfx in reinit to prevent Config already initialized
[BUGFIX] Bugfx in reinit to prevent Config already initialized

If the Application's reinit method is called the $this->init($initConfig, $input, $output); throws an UnexpectedValueException (Config already initialized)
because the $this->config variable is still set

this fix just resets $this->config

Found the issue while trying to install magento2.0.2 from command line via: docker exec -it magento2demo_app_1 bin/n98-magerun2 install \
--useDefaultConfigParams=yes --installationFolder="." \
--dbHost=mysql --dbUser=magento --dbPass=magento --dbName=magento \
--baseUrl=http://magento2.local/ --noDownload --forceUseDb=true
p-makowski/n98-magerun2,p-makowski/n98-magerun2,p-makowski/n98-magerun2