Improve Tuner VTS: Generate DVR Record Combos

This CL allows the VTS to read a vendor's configuration file, determine
if the given devices could support the DVR Record dataflow, and runs the
integration tests with all valid combinations.

2 functions were added to help drive the testing logic.
  generateRecordCombinations() generates all valid record dataflow
  configurations, and the integration tests call
  generateRecordCombinations() to analyze whether to generate these
  combinations or use the data flow provided by the vendor (if there is
  one).

Additionally, when dynamically configuring DVR_Record, a bug was exposed
in the VTS that came about from recycling the function
recordSingleFilterTest(). When LnbRecord was initialized with a software
frontend, the VTS was looking to the record dataflow's dvr source for
input. If record is not hardcoded by the vendor, the VTS would crash.

To fix this error, an enum class was added as a parameter to
RecordSingleFilterTest() to take into consideration which dataflow
(lnbRecord or record [no Lnb]) was calling the function. New behavior is
defined to take into account both cases. Also, lnbRecord will not be
tested if there are no hardware frontends, as this is not very likely to
be configured by vendors.

Bug: b/182519645

Test: vts-tradefed run vts --module VtsHalTvTunerTargetTest. Manual
tests with different input configuration files.

Change-Id: I76c05ca2e33767e4bdcd2072db5144d495d623b0