Rebuild and copy recovery and boot img when using vendor_otatools

  Rebuild recovery and boot images with vbmeta footers and copy together with recovery patch/install files when building vendor images using vendor otatools. Fixes validate_target_files failure.

Bug: 220126689
Bug: 186097910

Test: sign_target_files_apks \
        --vendor_otatools=otatools_vendor_dir \
	--vendor_partitions=vendor,odm \
	merged-target_files.zip \
	signed-target_files.zip
Test: validate_target_files signed-target_files.zip

Change-Id: Id45c67405bc37b769757db1701507f82cc6068d3