Move db migration of ml2 security groups to havana

ml2 plugin is a havana feature. Currently securitygroups table are
created in chain of migration after havana release. It causes db
migration failure when migrating from havana to current head because
securitygroups table is attempted to be created although it was already
created by create_all().

Closes-bug: #1271231
Change-Id: If450bd95de7a5fdfdb2219cfbf7eb0c1323044bb
Make sure dnsmasq can distinguish IPv6 address from MAC address

Currrently, due to in dnsmasq host file, the IPv6 address does
not be wrapped with '[]', dnsmasq cannot distinguish IPv6 address
from MAC address, it will cause the deployed instances cannot get
IPv6 address via dnsmasq dhcp service.

Change-Id: I023e44667a238664d11f2ac2cc484432cd301bcc
Closes-Bug: #1281916
BigSwitch: Stop using external locks

Changes BigSwitch server manager REST lock
to an in-memory lock since the plugin isn't
expected to run in independent processes.

Closes-Bug: #1284881
Change-Id: I2fdd5ba79a0c4b94b2b410db54a63f7c0ca47525
Avoid using "raise" to reraise with modified exception

The code changes the exception and reraises it.
This commit changes the code to use the same way as
excutils.save_and_reraise_exception does to ensure
the exception context.

This is the last patch of reraise clean up series.

Closes-Bug: #1279813
Change-Id: I8787dcbdc8321f75964de26e97cae395707aafc2
Fix NVP FWaaS errors when creating firewall without policy

Change-Id: I7ced6fe91a2d27c3739c54aa90489976532b3ecc
Closes-Bug: #1282366
Support advanced NVP IPsec VPN Service

The patch adds NVP advanced IPsec VPN Service support for NVP with VCNS:
    * NVP IPsec VPN is an  advanced Service depending on NVP
      advanced service router
    * NVP IPsec VPN Service will finally call VCNS IPsec VPN bulk
      reconfiguration to map to VPN DB logic

Implements: blueprint nvp-vpnaas-plugin
Change-Id: Ic8a96f5defc2b868c6f18fb4966b04079d3c781a
BigSwitch: Add address pair support to plugin

Adds support for the address pair extension to
the BigSwitch/restproxy plugin.

Implements: blueprint bsn-address-pairs
Change-Id: If03e8752155bcb8b21f5a427c54640c5b63f77f3
Remove nvplib and move utility methods into nsxlib

This patch completes the process of moving code from nvplib
to nsxlib. Utility methods such as do_request and get_all_query_pages
are transferred into nsxlib, so that nvplib can be safely removed.

Partially implements blueprint nicira-plugin-renaming

Change-Id: I43be18c89ac908ebae32b39a8508a7006b5fe328
Merge "Avoid using "raise" to reraise with modified exception"
Merge "Move db migration of ml2 security groups to havana"
Merge "Make sure dnsmasq can distinguish IPv6 address from MAC address"
Merge "Remove nvplib and move utility methods into nsxlib"
Merge "BigSwitch: Stop using external locks"
Merge "Fix NVP FWaaS errors when creating firewall without policy"
Merge "Support advanced NVP IPsec VPN Service"