Add a security scanner api config object for params

Change SecScanAPI to use a uri creation func instead of test context

Pass config provider through validator context

Remove app config dependency for validators

util/config/validators/validate_ssl.py

@@ -1,4 +1,3 @@
-from _init import config_provider
 from util.config.validators import BaseValidator, ConfigValidationException
 from util.security.ssl import load_certificate, CertInvalidException, KeyInvalidException
 
@@ -11,6 +10,7 @@ class SSLValidator(BaseValidator):
   def validate(cls, validator_context):
     """ Validates the SSL configuration (if enabled). """
     config = validator_context.config
+    config_provider = validator_context.config_provider
 
     # Skip if non-SSL.
     if config.get('PREFERRED_URL_SCHEME', 'http') != 'https':