* [TF FE] Support models with v1 checkpoints Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> * Fix build issue * Fix issue in load_impl * Fix MO unit-tests * Check input_checkpoint in argv * Fix build issue * Update src/frontends/tensorflow/src/checkpoint_v1_reader.cpp Co-authored-by: Maxim Vafin <maxim.vafin@intel.com> * Apply comments from code-review: split CheckpointV1Reader constructor --------- Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> Co-authored-by: Maxim Vafin <maxim.vafin@intel.com>