v1.5.0

• Added support for resource groups, since now it is preferred mode for creating resources.
• Parameter AUTO_PLACE renamed to REPLICA_COUNT (old one is still working)
• Added locking mechanism for better concurrency.
• Added support for specifying LS_CERTFILE, LS_KEYFILE, LS_CAFILE parameters.
• Snapshots are significantly accelerated by using new API which is not implemented in linstor-client yet.