TOTHAA-116
* fixes to retryable decorator;
* added test for validator arguments;
* added concurrent node spawning with scheduling timeout;
* added configuration variables;
TOTHAA-116
* improved logging
TOTHAA-116
* improved logging further
* using schedule timeout config vars in code
TOTHAA-116
* removed some annoying, pointless logging from auth_token_permissive
TOTHAA-116
* remove_failed_instance rewritten
* improved logging in retryable_operation
* added get_instance_by_name method to general
TOTHAA-116
* removed excessive logging from retryable op
* fixed remove_failed_instance once more
TOTHAA-116
* improved logging once more
* fixed get by name method
TOTHAA-116
* removing instance even when it's not present in the cluster
TOTHAA-116
* rewritten remove_failed_instance:
  * force deleting instead of just deleting,
  * improved logging
  * waiting for instance to be completely gone from nova, before returning from remove_failed_instance
TOTHAA-116
* force deleting after shutdown to speed up the process
TOTHAA-116
* resetting state before force deleting
* catching possible exceptions that can be thrown while force deleting (for example when the instance is already removed)
TOTHAA-116
* fixing index out of range issue
TOTHAA-116
* scheduling interval fix
TOTHAA-116
* small logging fix
TOTHAA-116
* changed schedule check to active check (now waiting for all instances to become Active, before declaring them as 'created')
TOTHAA-116
* logging status updates while awaiting for instance Active