Install test scripts into chroot.

This also removes support for all scripts that don't really work without a chroot
to only run inside a chroot.  This includes:

run_remote_tests
cros_run_vm_tests
parallel_run_vm_tests

Change-Id: I5c89466047047025de6c934b38ef6be8a23ea058

BUG=chromium-os:13498
TEST=Ran full x86-generic-pre-flight-queue with this CL patched in. CBuildbot / CBuild already have their test calls uses enter_chroot.sh -- before their test call.

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=98c6a53

Review URL: http://codereview.chromium.org/6736023
13 files changed