BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections - added tests
BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections - format classes according to checkstyle
BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections - made corrections
Merge pull request #713 from MikhailGorbachev/BACKLOG-370

BACKLOG-370 - CLONE - Mysql Bulk loader step minor corrections
BACKLOG-606 - Kettle remote execution: all requests are sent twice because authentication header is missing at 1st attempt

Code format
BACKLOG-606 - CLONE - Kettle remote execution: all requests are sent twice because authentication header is missing at 1st attempt

Fixed "addCredentials" method, add Preemptive Authentication.
Delete AuthScope.ANY because setting credentials with AuthScope.ANY authentication scope (null value for host and/or realm) is highly discouraged in production applications.
BACKLOG-606 - Add unit test for addCredentials method