Add waiting
Fix verify volume size method

Delete unused import

Fix method
Merge pull request #10 from Mirantis/fix_autotests

Fix autotests
Fix select environment version error
Merge pull request #11 from Mirantis/fix_autotests

Fix autotests select
Add method to verify ability
Fix engine
Tests for cluster nodes
Add elements to work with cluster nodes
Add xpath for disabled buttons Add and Delete, Placeholders
Tests for cluster nodes
Fix method according possible situation
Fix method
Merge branch 'test_cluster_nodes' of github.com:Mirantis/fuelweb-test into test_cluster_nodes