Fix the google validate_whitelists function to *fail* when only emails are configured and an email address not in the whitelisted list is given.
Also make the validate_whitelists function fail closed.

Signed-off-by: David Black <dblack@atlassian.com>
Use set() in the validate_whitelists function to check if an email or a domain is in the allowed white-list set of emails and domains respectively.

Signed-off-by: David Black <dblack@atlassian.com>
Merge pull request #745 from dbaxa/fix_the_GOOGLE_WHITE_LISTED_EMAILS_validation_code

Fix the google white listed emails validation code