Fetch all pages when listing NVP Nat Rules

Bug 1133318

Change-Id: I24e9943b4771c4f2b941c229ba1c300dfbf7e331
Fix NVP plugin not notifying metadata access network to DHCP agent

Bug 1133395

Due to recent changes in notification logic between Quantum and the DHCP
agent, the notifier the NVP plugin previously used for metadata access
network was not working anymore and needed to be replaced

Change-Id: Ifa0ea55116cf5ef6d546d28ca52e643987b3e5a0
Remove network type validation from provider networks extension

Bug 1133064

As the set of valid network types for the provider networks extension
depends on the particular plugin, validation should be performed there.

Change-Id: I3ce5762458bc553625a458ace80072bd804e31f0
Merge "Fix NVP plugin not notifying metadata access network to DHCP agent"
Merge "Fetch all pages when listing NVP Nat Rules"