started refactoring of node collection db calls
fixed tests. need to refactor network db calls
fix for flake8
[remove-nodes] do not send nodes in status discover
[naily] do not call remove_nodes method if nodes not provided
Fix typo in log message
Fix log message in deletion task
tests for node collection handler
remove debug comments
Dont allow to add new roles to deployed node
Merge pull request #1584 from Mirantis/fix-removing-nodes-with-status-descover

[remove-nodes] do not send nodes in status discover [PRD-1178]
UI messages
Merge pull request #1522 from mattymo/fuelmenu3

[WIP] Fuel Menu feature
consistently exclude boot volume in disks API
eagerloading for node collection handler.
GET api/nodes takes about 2 sec
fix tests
fix flake8
revert flake8 back, diff versions of flake
Small code fixes and improvements
Refactor dhcp code, flake8 and pep8 fixes