Until now the prefix uuid was generated with 'uuid1' command. In cases
where you started two environments with the same network names - the uuid1 usage
caused us to pass the same network name to libvirt, despite the environments being
different, thus throwing a libvirt error.

The reason is that we truncated the 8 last bytes of the uuid1 and joined
that with the network name. The 8 last bytes of uuid1 are most
definitely not random.
I see no reason to have the uuid not completely random - therefore this
patch changes the prefix uuid to be generated with uuid4, which should
be completely random.

Signed-off-by: Nadav Goldin <[email protected]>

This patch changes the 'prefixed_name' function logic, so it will
generate unique names, based on the Prefix UUID4 and the SHA256 hash
of the passed name.
This is required as we use those names in passed network names to
libvirt.

Signed-off-by: Nadav Goldin <[email protected]>

Signed-off-by: Nadav Goldin <[email protected]>

Signed-off-by: Nadav Goldin <[email protected]>