[lib.sh] Reset virtual nodes after MaaS install

[lib.sh] Reset virtual nodes after MaaS install

For hybrid PODs (e.g. x86_64 jumpserver + control nodes, aarch64
baremetal compute nodes), the virtual nodes rely on MaaS DHCP to be
up when the OS boots, so issue a `virsh reset` accordingly.

Instead of checking for online nodes using `test.ping`, use
`saltutil.sync_all` to also sync Salt state modules to the virtual
nodes (usually handled by baremetal_init state in HA deploys).

JIRA: FUEL-338

Change-Id: If689d057dc4438102c3a7428a97b9638e21bfdc5
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>