CFY-1431 added a validation task to packages urls; added bootstrap flags to new bootstrap mechanism
CFY-1431 modified storage for validations tasks to be in-memory; now deleting bootstrap directory on any teardown (i.e. on automatic teardown after bootstrap failure too); small refactorings
CFY-1431 small refactoring; fixed bug related to changes in the context API
CFY-1431 added a few logs for teardown/validation/bootstrap
Merge pull request #78 from cloudify-cosmo/CFY-1431-add-bootstrap-and-teardown-validations-to-openstack-plugin

CFY 1431 add bootstrap and teardown validations to openstack plugin