Added null check for keypairs
Merge pull request #24 from maksimov/develop

Added null check for keypairs
Fixing tests broken by new keypair handling
Merge pull request #27 from maksimov/develop

Fixing tests broken by new keypair handling
Better failure reporting for StatefulLoadBalancerTests#addServer.
Merge pull request #29 from maksimov/develop

Better failure reporting for StatefulLoadBalancerTests#addServer.