Fix incorrect change of Enum type

In migration 1341ed32cc1e_nvp_netbinding_update Enum type had been
changed incorrectly from ('flat', 'vlan', 'stt', 'gre')
to ('flat', 'vlan', 'stt', 'gre', 'l3_ext') for PostgeSQL.

The same problem is taken place for vlan_type in migrations
38fc1f6789f8_cisco_n1kv_overlay from ('vlan', 'vxlan', 'trunk',
'multi-segment') to ('vlan', 'overlay', 'trunk', 'multi-segment')
and in 46a0efbd8f0_cisco_n1kv_multisegm from ('vlan', 'vxlan') to
('vlan', 'vxlan', 'trunk', 'multi-segment').

In this change request was added separate method for changing Enum
type for PostgreSQL.

Closes-bug: #1301396

Change-Id: I27197fb7405630a55178be8516a4b62bd135e05c
Fix protocol value for SG IPV6 RA rule

The ingress SG rule for RA has a wrong value for protocol
field.

Change-Id: I4d3bca4b758540cf857eb13d36ee18f8ebc28272
Closes-Bug: #1312392
NSX: fix migration for networks without a subnet

In case the network is without a subnet, calling the validation
logic during the report phase leads to an error because the LSN
would have been already allocated during the migration phase.

Bypass the issue by calling the plugin directly, which is what
the validation logic does in the first place.

Closes-bug: #1313997

Change-Id: I14f77ae3b0cc147c4ea1c79e56bdd809de7c76a0
Imported Translations from Transifex

Change-Id: I35439d61689c7190ab7f802f0f81326656261a3c
Merge "Imported Translations from Transifex"
Merge "Fix incorrect change of Enum type"
Updated from global requirements

Change-Id: I6090b1bde89b25eaa1aea94024b7f4225375e65e
Merge "NSX: fix migration for networks without a subnet"
Merge "Updated from global requirements"
Merge "Fix protocol value for SG IPV6 RA rule"