Use cucumber for selenium tests

- this is the initial commit towards the use of cucumber
  for the selenium tests
- it contains a minimum of setup code and one single testcase
- old tests will be migrated over the time in several changesets
- new tests should only be written using the new cucumber framework

Bug: 48142
Change-Id: I4dd7d8d868e623e8ee606d1bb3e19297b26eb374