This adds the following vairables to be used with the 22_test_configs.sh
script, so that it can generate configs which have access to private
repos.
* AIRSHIP_CONFIG_MANIFEST_REPO_AUTH_TYPE
* AIRSHIP_CONFIG_MANIFEST_REPO_AUTH_KEY_PASSWORD
* AIRSHIP_CONFIG_MANIFEST_REPO_AUTH_KEY_PATH
* AIRSHIP_CONFIG_MANIFEST_REPO_AUTH_HTTP_PASSWORD
* AIRSHIP_CONFIG_MANIFEST_REPO_AUTH_SSH_PASSWORD
* AIRSHIP_CONFIG_MANIFEST_REPO_AUTH_USERNAME
Relates-To: #627
Change-Id: I791e45eb6747e76f0e69a7cdcfde90db570fa1d1