mgr/smb: add a new hosts_access field to the Share resource

mgr/smb: add a new hosts_access field to the Share resource

This access list can be used to allow or deny access to hosts by
IP address or network (IP/prefixlen-style). It partially borrows
from the previous work to do ip address binds.
The structure would look something like the following:
```
  hosts_access:
    - address: 192.168.7.200
      access: allow
    - address: 192.168.7.202
      access: allow
    - network: 10.10.220.0/24
      access: allow
```
or
```
  hosts_access:
    - access: deny
      network: 10.10.220.0/24
``

Signed-off-by: John Mulligan <jmulligan@redhat.com>