Generated a unique (per project) instance name for integration tests
Generated a unique (per project) instance name for integration tests

Fixes #66

joshlong/gcp-service-broker,rifung/gcp-service-broker,rifung/gcp-service-broker,GoogleCloudPlatform/gcp-service-broker,rifung/gcp-service-broker,joshlong/gcp-service-broker,rifung/gcp-service-broker,GoogleCloudPlatform/gcp-service-broker