Revert "Remove remote_path from packer templates"

This reverts commit 4afa1e5c8bdbffa63e4b6671b12af766914c652d.
Update fetch_packer_bosh

Clone and compile new packer-bosh instead of relying on pre-built
packer-bosh in S3.

Signed-off-by: Maria Shaldibina <mshaldibina@pivotal.io>