Copy --remote-image-dir to instance directory

Due to the race condition in cvd, cuttlefish instances cannot reliably
share a --remote-image-dir. Acloud copies images from
--remote-image-dir to the each instance's directory.

Test: acloud-dev create -vv --local-image ~/target_files.zip \
      --cvd-host-package ~/cvd-host_package.tar.gz \
      --local-system-image ~/system.img \
      --host 192.168.9.2 --host-user vsoc-01 \
      --host-ssh-private-key-path ~/id_rsa \
      --remote-image-dir imgdir
Bug: 293966645
Change-Id: I073167c5de8eda052ebccd9f955a4696d2ae02bb
4 files changed