NSX: fix API payloads for dhcp/metadata setup

NSX 4.2 GA has tweaked the way dhcp and metadata
ports are configured. This patch takes care of
that.

Closes-bug: #1312822

Change-Id: I4e8496bf721c0f35df4228ec9c6f8066275e8c7a
Removed signing_dir from neutron.conf

The default value from keystone middleware ($TMPDIR) is good enough,
so stick to it.

Closes-Bug: 1313780
Change-Id: Ideb393f9010f4f1706392ccdfdd5fa7307bda070
Imported Translations from Transifex

Change-Id: I7ac7de8fb1cea473df6059e9443df1418c800521
OVS and OF Agents: Create updated_ports attribute before setup_rpc

setup_rpc spawns rpc-consuming thread that can access
self.updated_ports before it is created in the constructor

Change-Id: Icc447c3bb7099125aae30e2430a6ad98ba00f6f9
Closes-Bug: #1314472
Merge "Imported Translations from Transifex"
Don't print duplicate messages on SystemExit

Don't log the error using LOG.error or LOG.exception and then
passing the same string to SystemExit since this will result in the
error being logged twice. Instead log the error and raise SystemExit(1).

Change-Id: I88b6632e6596a36a7168155dd4219e7d55078621
Merge "Removed signing_dir from neutron.conf"
Merge "NSX: fix API payloads for dhcp/metadata setup"
Merge "Don't print duplicate messages on SystemExit"
Merge "OVS and OF Agents: Create updated_ports attribute before setup_rpc"