[astute] Add progress calculation to RHEL download.
[astute] Add unit tests for LogParser::DirSizeCalculation.
[astute] Truly mimic DirSizeCalc to DeploymentParser.
[astute] Add comment about hardcoded values in DirSizeCalc.
[astute] Fix reviewer's comments. Add multipath DirSize progress calculation.
Merge pull request #43 from Mirantis/rhel-progress

[astute] Add RHEL progress calculation.