User info is added to collected statistics info

user_information.contact_info_provided flag is added to statistics snapshot.
Value is "true" if user provided his contact information to Fuel support team.

get_master_node_uid() is fixed to not raise exception when no master node
settings are in DB.

Tests added.

Closes-Bug: #1392655

Change-Id: Ib9c820792eed68938cbad9a1aafb7103811049ac
Merge "User info is added to collected statistics info"