Refactor site_power_status, power_strip modules into client/cros.

Change-Id: Id9ab9ae36bde45d00992179ee66ac4888a5e2323

BUG=chromium-os:12633
TEST=grep the entire autotest repo and find out all source code which has site_power_status and  power_strip and changed them.

Review URL: http://codereview.chromium.org/6627029
16 files changed