move multinode config to use line-in-file

Change-Id: I1ae7bfd459754962e01bab257fcc56bb616ed00f
Add support for skipping provisioning in collect logs

Libvirt runs want to skip the provisioning steps. This adds the ability
to skip tags for log collection with the addition of an (optional)
SKIP_TAGS_COLLECT variable.

Change-Id: Ib2acc2054859b137d3587aaacbdffe78745d1f75