Squashed 'cluster_manager/' changes from d73e538..cda0492
Squashed 'cluster_manager/' changes from d73e538..cda0492

cda0492 VFS-2400 Update ctool.
68ab84d Merge pull request #51 in VFS/cluster-manager from feature/VFS-2402-upgrade-dbms-to-couchbase-4.1 to develop

git-subtree-dir: cluster_manager
git-subtree-split: cda04928a7ab5b74d7774d99fc993d132b301740

onedata/cluster-worker,onedata/cluster-worker