Add cheeps option to acloud

Also has some changes to get this to work with tradefed. Namely, we return
the report object from BaseAVDCreate.Create and also accept --build_id and
--build_target.

Updates pylintrc to ignore imports for duplicate-code

Bug: 123304336
Test: ./run_tests.sh
atest acloud_test
acloud create --config_file ~/dev/acloud.config  -vv \
--build- id 5284144 --avd-type cheeps --branch pi-arc \
--autoconnect

Change-Id: Iaa8612c1fac46d748f303af2e7cfaefea8f7bf62
18 files changed