Use BASH_SOURCE[0] to find scripts directory

When sourced from toci $0 ends up being the directory containing
toci_devtest.sh, using BASH_SOURCE[0] is correct in both cases.

Change-Id: Ibc1f4e0519d610f6615e983f243b82dba2ec73db
Add a new remote ops JSON value to boot-seed-vm

After 03adc44 landed, devtest now assumes to use rsync for local
operations, since $VM_HOST is always set. This leads to devtest dying
horribly because it can't write to /var/lib/libvirt/images, whereas
previously it would use sudo cp since $VM_HOST was unset. Add a new
remote-operations key check to the JSON, which instructs it to perform
remote operations. This allows us to use that flag for tripleo-ci,
and have devtest still do purely local operations.

Change-Id: I192152db445eee5160dcd46181a35c87f96c2ed5
Merge "Use BASH_SOURCE[0] to find scripts directory"