Mix local images and remote target files for remote host cuttlefish

If the user requests to create a remote host cuttlefish from an Android
build, --local-system-image, and --local-vendor-image, acloud downloads
the target files zip from the build and mixes it with the local images.

Test: acloud-dev create -vv --build-id 10780728 \
      --build-target aosp_cf_x86_64_phone-trunk_staging-userdebug \
      --branch aosp-main  --local-system-image ~/system.img \
      --host 192.168.9.2 --host-user vsoc-01 \
      --host-ssh-private-key-path ~/id_rsa --boot-timeout 1200
Bug: 296249675
Change-Id: Ie568963444dd5daab4fd260a683fbda6090cc8f0
2 files changed