Merge changes from topic "merge_genrule"

* changes:
  gn2bp: Merge cc_genrule cmd
  gn2bp: Remove arch suffix from the genrule
  gn2bp: Support merging genrule
  gn2bp: Add function to merge modules
  gn2bp: Add function to merge cmd for genrule
  gn2bp: Add helper function to get condition for arch
  gn2bp: Update sanitizer to accept arch specific attributes
  gn2bp: Add action attributes to arch
  gn2bp: Add finalize function for non set attributes
  gn2bp: Add helper function to finalize attributes
  gn2bp: Update initial value of script and response_file_contents