* checkout one commit before the latest and check coverage
* check coverage with the latest commit
* all new lines must be tested
This functionallity essentially compares the current change
with the master branch, since the coverage job runs always
for only one change.
Change-Id: I902f209b87656cca9746a3536cff03b58c7e4222
Closes-Bug: #1670199
c4ea7ededf